Help Needed: Where and How to Add Threaded Elastic Wire in InMoov Hand (v2)? + SG90 Fit & Tendon Issues

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AwesomeCoolDude

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Apr 19, 2025, 10:08:28 AMApr 19

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Hi everyone,

I'm currently building the InMoov hand (version i2) and I’ve already printed all the parts. I noticed on the website it says:

“ With small servos of the JX-PDI1109MG or SG90 type, placed in an adapter and mounted in the palm instead of the standard servos. (In this case we do not put the springs, but elastic thread) ”

I’m planning to use SG90 servo motors mounted in the palm, and I’m using fishing line for tendon control, but I’m a bit confused about how and where exactly to add the threaded elastic wire.

Do I run the elastic thread alongside the fishing line, or does it go on a separate path?
Should it be tied to the same fingertip holes or somewhere else?
Any tips on what type or size of elastic thread works best?

Also, there’s only one tendon hole per finger, and it’s just the size of the fishing line—how are people managing to route both lines through?

Also, I’m facing two additional problems and would really appreciate some advice on:

Finger movement issue:
Even when I pull the fishing line via coding the servo, the finger barely moves. I suspect I’ve tightened the fishing line incorrectly or routed it the wrong way.
What’s the correct method to tighten the fishing line so it provides proper motion?
Fitting the SG90 in the printed adapter:
The servo doesn't slide in easily. I tried using a soldering iron to widen the opening slightly, but I’m worried that’s not the right approach.
Any tips for cleanly and safely fitting SG90s into the adapter?

Lastly—are there any videos, step-by-step guides, or tutorials for assembling the i2 version of the InMoov hand with palm-mounted servos? I couldn’t find much specific to this configuration.