I would be very thoughtful about not using the snaprings as they prevent a clip-on from slipping up and off the fork should the clamping bolt loosen. If you have ground off the locating pins the clip-on could loosen and rotate, causing hair raising control issues, but with snaprings in place at least the brakes would still work should it be the right one. Clamp bolts become the only line of defense with ground off pins. I just think everyone contemplating this maneuver ought to be aware of the degraded safety of flight issue, FYI. My track bike clip ons have no pins and checking the clamping bolts is an absolute must that I do before every track day as one of the "kill you straight off" items on the check list.