another I D
 

Picked up a few bits at a garage sale, some were obvious others not sure of. Leather pouch marked as 1941 clino case, has 2 small wooden blocks in base. Arm bearing is marked as Mortar with degrees on reverse. The spring thing I have no clue and is not marked. Extractor is self explanatory, marked 3" mortar. sorry for lack of focus on last pic.

You have a 3-inch mortar recoil spring. It connects to a recoil spring band on the mortar tube and the opposite end connects to a groove on the bipod cradle.

Photos show the 2-inch mortar clinometer that goes in the leather case, and the webbing pouch that your launching cartridge extractor goes into.

garage sale
 

Hey Bob, you need to back to the garage sale and collect the rest of the 3" mortar! I know Darrin is looking for any parts he can get. (hint)

Id
 

Thanks for the quick I.D. There was a variety of X mil stuff, but since mortar is not my scene it needed clarification. It will make good swap meet gear for Corowa.