I have larger hands and I find the shells I have too small to be comfortable to keep practicing, larger shell and pea works better and a sake cup is pretty much the perfect size but cups dont have that little divot that the shells do that allows the pea to slide in and out, sliding it out is smooth but in order to get it back under there has to be a slight lift which you don't have to do with the shells which looks better, so what's something I can use or gimmick to act like the shells?