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Hi Glen
I had the same issues with my 12" dob and I changed the primary mirror adjustment springs with heavier ones. I cut them to the same length as the originals by using a pair of pincers and used my 4" vice to provide the pressure! A grind over the sharp bit then a coat of nail polish will keep it clean. I used the original springs to give the locking screws some resistance. Try some blue Teflon tape around the locking screw thread to stop it coming loose.
Cheers!
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