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It can take some time to get this correct. Make sure the mounts to the finderscope are correctly attached. I loosened all the screws and started over a few times. I use it in it landscape mode (so my motor doesn't keep moving) and target a knot on a nearby fence or a neighbors chimney. Once you have something close aligned, you'll likely need to tweek it when you get to things farther away.
Look, after all of what you did and you cannot get anything to work you need to ask for your money back. Did you buy this from eBay? They do have a buyer protection plan. Obviously you did not get what you paid for. Even though you took it all apart it is quite defective.It must have set up too long in extreme conditions such as an attic or storeroom. If indeed it was checked out before you bought it only minor defects would be visible. This is just a suggestion Sir. I know it is not a fix and I'm sorry this happened to you.
The washers are there for a reason-- there is an adjustment screw for the worm gear-- and the Dec axis works off a friction clutch when you tighten the knob on the fork arm.
Are you talking about the center bolt on the tripod that holds the telescope on the tripod-- ??? If you overtighten this it will interfere with the rotation of the telescope....and can break the motor.
Here is Jan's LX90 web site with disassembly instructions and pictures--
If the hand controller on the LX6 has stopped working you have a problem since meade does not support this very old telescope. My only suggestion would be to place an ad on www.astromart.com looking for a new hand controller.
If the error message indicates a "motor fault" make sure you have a good power supply and or fresh batteries-- as low voltage will cause a motor fault error.
Later you said it was an LX90 LNT-- ?? so which scope do you actually own???
I had the same problem. I removed the motor and drive assembly and used a pair of pilers to gently rotate the drive gear a few times in both directions. I re-installed it and it began to work again. I also noticed that the grease on the drive gear and shaft was very thick. Cleaned and up and re-applied a lithium based grease and it helped even more. Be sure to remove all old grease from the aluminium block that the drive gear shaft rest in. Good luck.