Hearing something doesn't often times match up with reality. Send your scope to the address in Olathe, KS and tell them what is wrong. I have and they return them repaired usually at no cost.
The folks at the warranty depot in Canada have been repairing them without problem. You might want to give them a call. Back in the 90s dealing with Bushell repair people was scarey at the best of times.... hopefully they have improved. Definitely give them a ring...