The hand spring should have a bend in it towards it's end. The bend helps with retention as it's placed in position with the other parts.
You can see the bend in the drawing that was posted.
Joe, I work on several of those a year. I can't say that I've ever had trouble getting the hand in place though.
What is it doing or not doing for you?
The whole trigger group goes in as an assembly.
I've used JB Weld for filling voids and building up areas on fiberglass stocks and bedding scope bases to receivers. I've used some that was more than several years old( maybe 10+) on some farm repairs and it worked just fine.
Bobby
You can use steel wool and Kroil to remove some rust from the bore. Not much you can do about pits in the bore short of reboreing/rifleing or relining. I would clean it good and see if it groups. This you can do before investing time refinishing. Tru-oil will be fine, though I like Permlyn a...
I do use paste wax on my wood stocks. It improves the grip and helps repel water when hunting in the rain. I also apply wax to the checkering with a toothbrush. Buff the stock with a dry rag and the checkering with a clean, dry toothbrush.
Bobby