Brief Description: 2 - Drill out main undercarriage bolt holes
I have seen other Sling websites where they found out too late that the main gear bolt holes need to be reamed to 10mm before skinning, or heard about it in the nick of time. I am greatfull to those builders for posting about it, otherwise I would have been doomed to the same fate of tedious, confined, almost impossible reaming.
I ordered an extra long 10mm drill bit from McMaster Carr and I just found my right angle bit attachment that I bought years ago. I'm in luck. This setup made very quick work of the job.