Thanks!   At the recommendation of Colorado Coffinmaker I used a 5/64 drill bit secured with JB Quick. I used a regular fiberglass cutoff wheel to shape the post after installation. For the hammer channel I used a stack of 3 cutoff discs that think i got at Wal-Mart; they're a smaller .93 diameter.   I used a good center punch to locate the hole. I have a cross slide milling vise which also helps drilling. I found out working on flintlocks that an optivisor with a decent ligh