Anyone ever disassemble a distributor - need help

Mattax said
Swapped 'em, welded and brazed and filed 'em.
No they are not all the same.
That's 11 degrees of distributor advance, 22 at the crank. It will be a little less on the engine unless running points.

The amount of advance depended on the engine configuration and what clean air package it had, if any.
11 in a electronic distributor is nice for a slightly hotter cam and no pollution control.
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I’m not going to mess with that piece. I don’t know where the spare came from. But, it says 11 R for right rotation. The one on my current distributor says 15 L for left rotation. I about have it back together. Is there a trick to reinstall that little clip ? I also found in a video, when you swap to a lighter spring. You should plug vacuum canister. Is that right ?