Good evening forum members. I have a 10” LX200GPS that has been working great. There have been no issues in polar aligning when the scope was set to polar home or anytime else when slewing to different objects. I then decided that it was a good time to get into AP. I researched and the common advice I found was that the 10” should be able to handle around 20 pounds. So, I started to order things to put it together. First to arrive was a Losmandy D series plate with the counterweight. I installed it and with the weight attached, all things worked well. No perceivable issues seen in slewing, but I have to admit, and I haven’t had clear skies to test outside. With plans to piggy back an ED80 APO I purchased another Losmandy D series plate to mount on top to hold the APO. Once it was installed, I did another quick indoor test with both plates attached but without the counterweight. That’s where things went bad. I set the scope in polar home and powered up, and Smart Drive started its small RA slew. About halfway through that slew the RA clutch started to slip, and I had to powered off to stop it. I checked and the RA lock was tight and no other equipment was attached. I tested it twice and the clutch slipped both times. I removed the top plate only and tested again, and things worked as it should and without slippage. I can’t believe that adding a 4 pounds plate to the top overloaded the clutch. I estimate the with the scope, both plates, rings and eyepiece the total weight I am looking to add is around 18 pounds max. So now for my questions.
What is the estimated weight can I add?
Is there an adjustment that I can make to the clutch?
Is there a clutch mod that can be done?
Do I need forget about mounting the APO on my 10” an just buy another mount?
Many thanks and any ideas/help I would greatly appreciate.