Size of Drill bit for S&W pinned sight replacement?

[TacticalReload]

I asked this question in the smithy forum as well, but I wanted to see if anyone here knew the answer...

Can anyone tell me the size of the drill bit necessary to cross dril a replacement front sight blade on my 625? #56?

 

[MADISON]

Contact a competent Gun Smith and ask him/her.
If all else fails phone Smith & Wesson and ask them.

 

[JoeHatley]

#54 wire.

Joe