William Optics GT81 - Focus Lock Screw

[groberts]

Can't recommend this scope enough but one small issue - I've always found the focus lock screw a bit too weedy i.e. difficult to get good purchase on the small knurled knob to lock it down firmly.

Does anyone know what the thread size / type of this is + a source for a replacement with more bite i.e. probably just a better knob which provides better purchase with which to lock it down?

Graham