How to make simple part

[Larry$]

There is more gullet space on a 2 flute. End mills, even the ones called center cutting don't cut in the center because there is little or no relative motion at dead center. A great device for holding indicators is the single point of lock like the Noga. Get one with the fine adjustment on the mag base. It allows you to bring the indicator to zero w/o wiggling it all over the place. Once you have the indicator in place very gently tap the arm to make sure the indicator has settled and not hung up. Cheaper indicators can be jumpy because their action isn't as smooth. You aren't (usually) measuring with an indicator, you are comparing.