Since it was raining quite heavy,no bow hunting today.
The vent liner in my Triumph worked so good I decided that I would like to have one in my Endeavor as well.
The first thing I found was that the Endeavor BP is considerably harder than the Triumph BP; if you do this project do not turn the drill any faster than 180 RPM and let it feed at its own speed and use a good drill, carbide if you have it.
I mounted the BP in the milling table vise on my drill press and using a #1 drill I line the hole in the BP up with the drill so it was on dead center.
I then took out the #1 drill and mounted a #8 drill and drilled out the touch hole, then I took that out and stepped up to a # 16 drill then stepped up to a # 21 drill. I ran the drill all the way through the seat for the 209, this has proved to have a major effect on reducing the carbon build up under the 209 seat. This is the right size for tapping a 10-32 thread.
then I took a 25/64 drill and inset the end of the BP the distance of 4 threads.
I then mounted the tap in the drill press and took the top belt of the press off; lowered the tap to the breach plug and put about ten pounds of pressure on the handle of the spindle on the drill press turned the top pulley of the drill press by hand until I had 9 complete threads since the Lehigh V liner has 7 and a half threads this is just right.