Bach, the parts you are referring to comprise the trip assembly. That is what keeps the toplever to the right and the locking bolt in its rear position until the locking lug on the barrel set trips out the pin upon closing the breech.
Apparently, the trip spring (leaf spring) on a Crass model is a bit longer than that found on a Lewis model, and what Numrich had listed under its Crass model parts for sale was a Lewis model spring. It makes sense, the longer spring for the Crass model, since I believe the Crass receiver to be a bit longer than the Lewis.
If Jeff can get you the overall length of his Crass model spring, you can attempt to contact Numrich. Hopefully they will be willing to go through their stock of "Crass model" trip springs looking for the longer one(s) to send to you as a replacement. As mentioned once before in this thread, I had given something like that a try with them before, to no avail. Probably worth a shot, though.
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