I have Omegas with "perforated" as well as "closed" (not going all the way through) lug holes, all 18mm lug width.

1. Am I supposed to use different spring bar types for the two lug types?

2. I have seen original Omega spring bars touted as superior - any opinion?

3. Any reference to a "spring bar bible" like @omegastar 's excellent buckleology would be appreciated!

Thanks in advance to all