Holley 1920 diaphram return spring

Ya , I think that is what I'm going to do , maybe some day I will go back to 1 carb. maybe a 2 barrel? Is it a big deal to put a bushing in there if the leak gets worse?
Bushing the throttle body is best left to somebody w/the right tools & experience, but it can be done at home. The tools to do it right will probably cost as much as someone
may charge to do it for You tho', so unless it's the experience You're in it for............................