Recoil pad fitting on old SxS (to grind to fit)

[Canuk]

Hi all,
looking to put a new Silver pad on one of my old guns (1915 Fox SxS). I guess there is a jig of sorts that you use to get the angles just right. e.g. Wheeler Fixture. but I dont have one.

I'm thinking i'm probably best getting someone who has experience to do this for me.
Does anyone have any advice on who I might contact to help me with this.