Maybe it's not a case of "not interested" but of "not able to make a useful comment".

Remember all responses are voluntary, you may hope for a response but not expect a response. ■

Designing?? You buy a proprietary gear pair out of a hardware catalogue. There is no need to lock the handle of a worm wheel except for security purposes. To do that you slip a lock over the handle fulcrum arm just like locking process valves. Either you are grossly underpaid, and underworked, or there are no hardware suppliers in your part of the world. Evaluate your design cost against bought out parts. No contest. ■

I understand that you are talking about locking the pinion of a worm set rather than locking the higher speed wormshaft which carries less torque. That in itself is faulty mechanical design and reduces the precision of your apparatus in direct proportion to the gear ratio. Worm gears are unable to run back of their own accord unless the worm pitch is absurd enough to generate tremendously high bending loads on both axes. Your torsion preload can be perpetuated by locking the handle on your wormshaft. It is standard practise with equipment on all industrial plants where attempting to lock the working elements themselves is well acknowledged to be impractical.

Just so long as one of us understands. ■