P1917 Rifle - Magazine floor plate plate catch

I have a Winchester manufactured (SN 124XXX) Pattern 1917 rifle. The bottom plate on the trigger guard housing is not engaging and staying in place. I think I do not have the floor plate catch installed incorrectly. The rifle was re-barreled and the rest were re-blued.
If someone knows the correct orientation of the floor plate catch, can you please let me know?

Thanks,
Greg

Looks like it's up side down...here's the original book, can you see what I mean?

Jim;
That did the trick!

Thanks,
Greg