I have a 440 -6 engine with orig dual point dist. measures 3.90" from base to shaft tip @ bottom. it is only sitting about .080 " in the gear slot . there is around .300" in the gear . Is there any way to get that down in there to say .200" or so? it shows signs of riding on the edge of the shaft. I put in a new BRASS bushing . could that be in to far ? I don't see any room to drop it with dist. shims . if it is the shim , can I change that out without disassembly ?