Old farmer,
I love the Perrins owners club and would like to add a Perrins to my collection, I'm guessing you are in the UK?
For measuring the hammers and ordering either from peter dyson or e j blackley and son, use your calipers and measure from the center of the axle hole on the locks to the hole that the pin protrudes from. Holes must then be drilled in the hammers and broached out to a tapered square hole - it can be fiddly to get right.
IF you are in the UK I have an original 14 bore pinfire case in my collection; for the purposes of your restoration I will loan you the case in order to take measurements so you can have them reproduced or make some yourself or what have you.
if this is any use to you PM me.
