Ah! No, don't violate any protocols, I thought maybe you had found something on line. A shot or two of the nitty gritty elements would be appreciated. If you're like me you might take step-by-step pictures anyway so it can go back together without too many leftover pieces! Having tinkered personally and professionally with mechanical/electrical gizmos, I can probably sort it out enough for my purposes, but in my old age I've begun to admit less need to re-invent any wheels!
For what it's worth, here's a couple of (possibly) useful links:
One guy's take on the 124 non-G
Somebody's light seal repair
Some bits on its earlier sibling