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Its impossible to say what's causing it until it is fixed!
Whatever you do, don't give up. These things can take months.
Learn to use your scope and take pictures of it so they can be posted here.
I've got 55 years of experience and it took me weeks to permanently fix
the horizontal in my CT-100. And I have several scopes I could and
did hook up all at once.
How does the lock vary with signal strength?
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