9n draft control spring/center bolt

Hey everyone me again lol

Hope everyones having a good new year, mines going good working on the 9n, well i decided to put the NAA piston and seal in which reminds me which side does the leather wiper go on???

I noticed that all the moisture had everything extremely rusty so i decided to take it all apart to clean and relube.

when i took the rear draft control spring off but it pulled all threads off both pieces are no longer good. The piece that screws on that holds the spring on and what the spring covers part numbers 541 and 546. Are these the same as the 9n??

Thanks for any help