Guitar volume and tone knobs that are held in with set screws rather than pressed on are popular and can look great but can sometimes be a pain to install. Depending on the height of the shaft,they can come down too far and scratch the finish or want to tip sideways and look tilted. If the shaft of the potentiometer is a split shaft,you can bend one tine in on itself making it impossible to go on straight or even break the pot. This can make what seems like a simple task very frustrating. I like to use,size permitting,the little brass sleeves to go around split shafts. These brass sleeves are inexpensive and if your local guitar shop doesn't carry them they're available from Allparts. I cut up some cardboard into little squares and lay them around the pot shaft. This gives the knob something level to sit on while you tighten it and gives the right size gap between the knob and the top of the guitar. It's always good advice but it's extra important to use the right size screwdriver or allen wrench for the job here.

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