Replacement Holdopen fits well, but toggle not staying retracted with mag

[RShaw]

Hi All!
Some of you may remember my broken holdopen on my shooter 1918 DWM... it has shot fine since then, although it is picky regarding ammunition.

Today I finally received a new holdopen.

I installed it and it fits well; the rear "L" prong rises up when inserting a mag, and drops when the mag is dropped out, but the toggle is not held back as it should be when the mag is in.

I notice that the spring has more of a bend in it than does the original spring. The barrel assembly also does not slide back and forth quite as well since the spring protrudes only slightly into the plane of the rail just above it.

I'm thinking of switching the springs to see if that does anything... if that doesn't work, I'll have to bring it to my LGS. The toggle did stay back once out of many tries. Other mags are also not working. I think it's very close, but it's certainly not doing it's job yet.

Any other ideas out there? What adjustments are "normal" for a replacement HO?
Thanks a lot in advance,

Cheers,
RShaw