I purchased a Mimosa table clamp/wall-mount manual grinder. I have taken it apart completely, cleaned, and lubed well. I'm using it for espressos in my La Pavoni Europiccola. The doubles are tasty with nice crema. The burr axle rod has some play in it...was wondering if anyone has suggestions for some sort of bearing or bushing I could slip onto the 17mm diameter rod to eliminate the play...or just leave it alone?