1916 Erfurt "Failure to ****"

[DonVoigt]

I would try another breech block, or a toggle assembly- but I guess you don't have another or you would have done that already.

Got a friend with a luger? I'd borrow a toggle from a shooter and try it.

Since the FP guide won't stay in place, it does seem the block is the likely culprit.

What area of the country are you located? Someone may be close enough to help.