I feel like I have more trouble with countersinking than anything else. This is my second part that I have to replace due to a countersinking error. I have a dedicated microstop cage for my 3/32 bit, and I always do a few test holes in scrap, but I still seem to get inconsistent results. Fortunately, this was only an $18 part. I've been using my cordless drill for the countersink. Would it be any better to use the pneumatic drill? Any advice appreciated.
Another countersinking error by Matt McCoy, on Flickr
Another countersinking error by Matt McCoy, on Flickr