Hi, i've just bought CTS pots SOLID shaft to replace my old SPLIT SHAFT pots on my JV fender pbass. BUT they don't fit into the pickguard, they're too large!! it seems that jv fenders don't have regular pickguards hole so my question is, are the cts SPLIT shaft thinner or are they the same as solid shaft? what can i buy to replace the old pots(~5/16" ). thanks.