I have a old Marlin 39a 22 rifle with a old 2.5x scope with a small shaft. I think it is a 5/8". the scope has some dirt inside of it and is not very bright at all. I would like to upgrade it to a newer one. nothing fancy. I dont want to change to a diferent scope mount so I have to stick with the 5/8 shaft. Does anyone make a scope like this? I am having trouble finding one. If not do any of you in the tacoma area have a old one I could buy? I would like 2.5, 3 or 4 power.