Alan;
The very first shotgun I personally owned was a J Stevens Arms & Tool Co 12 gauge double which I think must have been a model 335. Unfortunately, I traded it off some 55 years ago. I had it in mind that it may have been a 325, but it didn't have mono-block barrels. At that point in time, I didn't know what chopper lump barrels were so can't say if it had them or not. It had the plain wedge bolt & not a rotary so would have been no higher grade than the 335.
After I bought it I found it would double if the back trigger was pulled first. Investigation showed the holes in the sears were worn & they could shift about a bit. The left sear tail sat a bit lower than the right one so when the back trigger was pulled the sear tails rubbed together & both sears lifted. I placed a small coil spring on the sear pin between them which pushed them apart & it never doubled again.
I knew a man who went to look at an old McCormick gas burning tractor, a W9 which was priced real cheap because it wouldn't run. He looked it over & paid the owner, who then went in his house to write him out a receipt. While he was gone the man took a piece of chewing gum & stripped off the foil wrapper, removed the distributor cap & placed the foil inside. When the owner came back out of the house it was running. His nephew was with him so he drove the truck home & the new owner got on the W9 & drove it home.
The nephew told me about it later when he came to work where I worked & we came good friends, but he didn't know exactly where in the distributor his uncle put the foil, but the reason it wouldn't start was it was failing to produce a spark to the plugs.
