Have only found those narrow v-bits in 1/4 shaft. (MLCS) That is why I wish CW would offer some different degrees with a pressed collar. But I use Whiteside collars which have 6 "squeeze slots" and haven't had any slippage. I put a CW plastic collar above and below and am careful when slipping them in the chuck not to use very much pressure and the depth has always been approved by the machine. Have used 45 degree bits also and quite honestly, unless it is a large sign I don't go above the 45 degree much anymore. Just looks nicer on wall plaques to me. Outside signs in cedar or white oak are a different story.