I consider to take some details from an Ignition breaker point, weld it on the vacuum advance canister and gain an easy and precise limiter. But I have only read about this as a solution in the old days. Any reason why nobody does this today? I have the crane solution also, but I don’t think it wouldn’t be as precise as a bolt. About the bolt version, I’m worried that the sheet metal wouldn't be strong enough and flex but I trust the work shop welder. Or that the distributor would get damaged when it bumps on the bolt all the time. (I realize I need to make it smaller) .
