a pedersoli frizzen to an original Brown Bess

[Jdzara]

Hi,
I'm trying to install a pedersoli frizzen to replace a missing one on a 3rd model Bess.
My problem is that the frizzen has a #8 hole for mounting, and the lock has a 10-24 hole.
The frizzen is very hard and neither my drill nor a file does any thing to it.
Suggestions on opening uo the hole?
Thanks,
Jerry

 

[BLAHMAN]

You are going to need to soften or anneal that area you intend to drill.

You may be able to do so by creating a 'heat sink' to prevent the face of the frizzen from also getting soft.