[magnets]

Originally Posted by bs7280

What about this one:
http://www.andymark.com/RAW-Box-p/am-2372.htm

Sorry if it is obvious, I have not been able to find anything

This too is a four start worm, and will easily backdrive on a vibrating and shaking robot once it's worn in.

Try using a ratcheting mechanism or clutch bearings from http://www.bocabearings.com/bearing-...h-bearing-csk-