Hi Robin,
Make sure your worms arent too tight and stalling. I did a lot of work to get the worms just so on my mount. What I found was...
1. Get the load that you are going to use on the mount and get it balanced.
2. take the pcb out and take the ra motor out.
3. check the worm spacing by spinning the spur gear with your finger inside the mount. IF it binds up or is tight adjust the worm as needed.
Brett
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