John, if it is Anna's scope, then I think you need to do some balancing of the finances with Anne, and explain that she has already spent thousands on the scope, so the least she can let you do as a matter of equity and fairness is buy a measly focuser....one that will actually benefit her more than you because, as we have said, it is her scope....
Interestingly , I beleive the WO crayford is the exact same one sold by Guan Sheng fitted to the GS dobs. Anyone who owns a GS crayford will notice that the main body attaches to the base with grub screws. I beleive the crayford is designed to fit different bases for different applications.
