I have a screw loose. Actually, two screws. Not ridiculously loose, but certainly not as rigid as I prefer. This is the first time in a long while I've come across this problem; I simply don't have the right screw/nut combo in my little box of cartridge hardware to fit a 33PTG. What I'm looking for is an assortment of screws/nuts that can be tightened with a hex tool, not unlike what Lyra supplies with their carts, albeit slightly longer in length and with nuts. Is such a thing available for purchase? TIA