Rifle57,

I've just found two other articles that would prove very informative for your build.

Forgive me for pushing Vic Venter's "barrow" again.

From July/August 2013 edition of Shooting Sportsman magazine, Gun Craft column, "Spring" by Vic Venters discussing the importance of not having the barrels down on the water table of the action allowing for some spring.

From May/June 2013 edition of Shooting Sportsman magazine, Gun Craft column, "Re-jointing with a new hinge pin" discussing this process.

I can recommend these articles to any one who deals with hinged firearms as, eventually, you'll end up with one that "has the shakes" and needs rectifying and I know there are many among you who'll want to do the job yourself.