One of the few complaints people have about Hismith’s otherwise fantastic range of sex machines is stability. The harder and faster you run them, the more the frame wants to rock, slide, or travel across the floor.
Fortunately, because Hismith uses a fairly standard 25mm tube diameter throughout most of its range, there are plenty of ways to improve things. Some are free, others require a trip to the DIY store, and a few turn the whole setup into an entirely new experience.
Table of Contents
Video Guide
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1. Flip the Legs Around
This one costs absolutely nothing. Most standard Hismith machines use the same tubing for both the legs and upright supports. If you don’t need the machine at its maximum height, simply swap the legs around so the longer pieces become the feet.
That instantly gives the machine a much wider stance, lowering the centre of gravity and making it noticeably more resistant to rocking. It won’t eliminate movement entirely, but it’s probably the best five-minute upgrade you can do.
2. Buy Longer Poles
If you do need the full height, consider replacing the short foot pieces altogether. Hismith uses 25mm tubing throughout its machines, which means compatible aluminium or stainless steel tubing is surprisingly easy to source. I picked up a pair of 2m bathroom support poles from a local DIY store, and they fit perfectly; you may just want shorter tubes to act as wider feet.
Just be sure to buy exactly 25mm, not 1-inch equivalent which is 25.4mm — the fixings on the machine are very unforgiving. While longer poles aren’t needed for stabilization, they can be immensely useful for raising the machine up for use on a tall bed.
3. Add Weight to the Base
Sometimes the simplest answer is making the machine heavier; specifically, weighing down the legs. A couple of sandbags, or even a pair of heavy dumbbells strapped to the frame can dramatically reduce rocking during use.
4. Mount It to a Plywood Platform (or Use the Official Baseplate)
A sheet of 18 to 25mm plywood makes an excellent foundation, and the legs can be U-bolted directly to the board. This is a really cheap way to instantly add some weight to the base, and has the added benefit of stopping the legs twisting. Lying or kneeling on the platform while it’s in use will add your own body weight — and it makes for a handy fixed tie point to attach some bondage cuffs. It’s not the most elegant of solutions, but it’s cheap.
Hismith sells their own baseplate to add weight and prevent rotation of the legs. At $120, it’s a more premium upgrade, and the fixed leg positions means angling the machine may be trickier.
5. Improve the Grip
Not every machine tips over. Quite often, it just slides away. If you’re using the machine on slippery laminate, hardwood or tiles, placing the entire machine on a yoga mat will all help keep it exactly where you left it.
6. Strap It Down
If you always use the machine in the same room, you don’t necessarily need to rely on weight alone. Heavy-duty ratchet straps or a belt can be used to anchor the frame to a sturdy bed, heavy furniture, or permanent wall anchors. This creates triangular support that dramatically reduces movement without permanently modifying the machine. We use these bed bondage straps (some of our favorite bondage kit!), and just wrap them around.
7. Lower the Centre of Gravity
It sounds obvious, but the higher the machine is extended, the more leverage each stroke generates. Whenever possible, keep the upright shorter, use a lower mounting position, or adjust your own position rather than extending the frame to its maximum height.
Even dropping the working height by 20 or 30cm can make the whole setup feel significantly more stable.
8. Build or Buy a Bondage Frame
This is where things get really interesting. We bought a complete modular bondage frame kit from AliExpress for around $300, largely because it also uses 25mm tubing. That effectively turns it into a giant LEGO set that’s compatible with Hismith parts. Everything slots together surprisingly well, allowing you to build a much larger, far more rigid frame while still using your existing machine. Note that if you want to attach the machine directly to the leg cuffs, you’ll need a t-connector bracket that can separate into two pieces; some machines are supplied with a single piece bracket.
An even cheaper alternative is the YingYu K9 bondage frame, usually around $200 to $250 on AliExpress. It isn’t quite as modular, but it includes a dedicated 25mm machine mounting adapter designed specifically for square frame tubing, so you can securely attach a machine to the end. You’ll find a number of bondage furniture pieces with dedicated machine adaptors.
We modified ours slightly by fitting a wider, more comfortable glossy chest support, but even in its standard form it’s one of our favourite setups. The added stability alone makes it worthwhile, while the frame opens up plenty of other possibilities for accessories later on.
9. Build a Custom Frame
If you’re comfortable with a drill and a tape measure, the ultimate solution is simply to build your own. Because Hismith uses such a common tube diameter, you can mix and match 25mm steel tubing with Kee Klamp fittings, scaffold connectors, or other modular hardware to create a completely bespoke frame. A large rectangular frame barely moves even under the most demanding use, and gives you plenty of extra mounting points for accessories, restraints, shelves or storage.
It takes a little more effort than the other options, but it’s about as close as you’ll get to a commercial studio setup without spending thousands.
Compatibility
The advice in this guide applies to most modern Hismith machines that use the company’s standard 25mm tubular frame system, including the Premium (3.0, 3.5, 4.0) and newer 200W Max, as well as the Servok. It won’t work for the Hismith Mini or any of its derivative, including the Sinloli Ukelele, Kiiroo or Lovense sex machine. That’s because those use smaller legs that are welded to the feet crossbars. Some of this guide will still apply to those — the Hismith official baseplate works, as would bolting them to a plywood frame — but anything that refers to 25mm tubes won’t apply.
Before ordering replacement tubing or accessories, it’s worth measuring your own machine to confirm the diameter.