down channel restriction

[firebird*boz]

Woundering  if the Iddle down channel restrictions can simple be drilled to correct size? or do the need to be pulled & correct size inserted?

any help would be appriciated.
thanks Boz.

[Cliff Ruggles]

I would not drill them with a power drill.  Just insert the desired bit into a pin-vise and size them by hand.

We have replaceable inserts if  you go too big with them.....Cliff