I'm looking for inexpensive linear actuators. I bought a $15 unit that uses an M3x0.5mm threaded rod and it's not horrible, but the effector has a lot of backlash. This has more stroke than I need; I only need about 65mm of stroke. But I wouldn't want to be particularly larger than this. Roughly 20mm x 20mm x 100mm would be my target envelope.

I'll fall back to using this with backlash compensation if necessary, and I don't want to spend a lot, but if someone knows of something substantially better for not too ruinously much more money, I'd like to become aware of it.

(This is to control a high voltage variable capacitor I'm designing for a #HamRadio small transmitting loop antenna. I'm trying to make the whole thing sufficiently inexpensive that a ham doesn't really have to think twice about making one.)

#DIY