Take the rubber hose off the end of it. Then get a SMALL screew driver and stick it in the small hole that the vacuum hose was hooked to and turn the small screew that's inside of the vacuum advance...
Go to cranecams.com and download the instructions.
NEW ANSWER: Remove the Vacuum hose from the vacuum advance, and put a small screew driver into the hole and turn the screew in or out. Need to turn...
>you don't adjust the vaccuum advance. you adjust the distributor. then when engine is running the vaccuum advance will work automatically to the needs of the engine< As a matter of fact, the...
You can purchase an aftermarket adjustable vacuum advance canister from most any auto parts store and follow the instructions for installation and adjustment.