Pulling V.A at idle

Mattax said

So odds are that its already advancing. When the engine slows down (transmission placed in gear) timing decreases. How much depends on how quick the primary advance is. it can be pretty dramatic as illustrated above. If you have four hands and an extra foot you can see that in the timing light and tach. Just be careful if measuring timing in gear! The extra hands and a foot on the brake is better than relying on chocks alone.

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This alone is why I like to fill in the inner side of the advance slot and not the outer side when limiting advance. The inner fill in tensions the springs more and reduces the chances of timing drop out when pulled in gear. Moves the rpm that advance starts showing up a bit higher than at idle or right off idle.

If you like the level that your advance is all in, then the inner is the play. Fill the outer and springs need more tension to control the weights.