Where to find a 3/4" tube Scope?

[NorthernCX]

I've got a nice old Cooey 600 with a scope mount donated to me by a member here. Problem is, the scope it came with can't be adjusted to anything better than an inch and a half low at 20 yards... so I want a new scope.

Real problem is that it's a 3/4" tube and so far, the only tubes that size I've been able to find are in a $20 Tasco... any other ideas?

 

[Ar180shooter]

Maybe try adding a shim under the scope tube to raise it a little bit. You're not going to find a 3/4" tube scope that is any good.