Jim, Eric and Perry thanks.
Perry it is suspended from the floor joist. I tapped a 1/4-20 hole in the end of the dial shaft and put a threaded eye bolt in it and put a "j" lag bolt in the joist. From members here this is how I came to this style as the other one I made wouldn't work correctly. Also I believe the one that they sell for $100 does not have the spring and you do not suspend it, making the readings almost impossible to duplicate.
I still would like to get a reading between the two bars before inserting barrel and then again after inserting to see how much the spring bar does deflect. I know it can not be great maybe a few thousands.
From the members here on this site, I do believe that anything can be accomplished within reason. There are people here with all the talents that could be wanted for what we love about sxs.
There are premier gunsmiths, stock makers, engravers and journeymen all here to answer questions and help one another out.
I'm still curious about the muzzle end, has anyone seen this before?
In thinking about it, just round it to .070 & .070 = .140 = combined wall thickness it would read between the two barrels and now it reads .055. that means .085 or .0425 removed off each side of the barrels. I'm impressed.
I believe they did just what you think they did. Some, if not all of the older Browning Superposeds were filed flat where they came together, probably part of the regulation process. They too, are thinner(together) where they are joined than either barrel was, originally. Probably impossible to add even thin screw-ins to them.
