I have an older SL 68II (not the newer versions) and the hopper feed neck is pretty small. Do you know if (and where) I can find a hopper adapter for it?
I'm not aware of any company that currently makes or sells the feedneck adapter for the first gen sl-68 II's. In place of the adapter you can try getting creative with some PVC or copper piping. I've even seen aftermarket threaded feednecks modded to work as well.