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Wormdrive Backlash

All worm gearboxes are going to have some backlash, for lubrication purposes, and the longer the lever CTC the more noticeable the free play is.

A slight positive weight pre-load on the levers, rather than a perfectly balanced rig, will help make the backlash a little less noticeable.

Linear actuators are an alternate and are more efficient and you can build your own: https://www.xsimulator.net/community/faq/diy-linear-actuators.248/

This is about average wormdrive backlash and the greater the lever CTC the more noticeable it will be:

Credit @noorbeast: https://www.xsimulator.net/community/threads/bastiuschas-2dof-project.10083/page-4#post-146320