I changed my P-bass pickguard, so I had to remove knobs, but they came out with a metal stick (on the pictures of knobs I saw neither of them had a metal stick below it, just a hole) and they're falling out if I'm putting them back. I was just wondering do these metal sticks have to come out or not and if not, then how could I get them back there? I didn't find another topic about it thought there might be and I'm sorry for mistakes as I'm not a native English speaker. Thank you. --- My dad and brother did something weird and they put the shaft back somehow, I didn't have to change the pots, I'd like to thank everyone who teached me a bit about the bass.