knobs. i used to save everyone i found. then i had to adapt plans to fit what i had. then came the internet and i had to search multiple vendors to find what i needed. now i just make whatever the heck i need when i need it. if i have a saved one that will work i use it,if not, i make one. aluminum,brass,steel a SHCS,and some loc-tite make good knobs for indicators and other finger-tight things. 5/16 press-fit,loc-tite knobs begin to be too big to tighten without loosening after a while.