Its very hard to find 510 headlight parts, if you have the round headlights, good luck. The square headlight are a little easier to find, but still hard to get them. Ebay is your best bet.Chucez wrote:Anyone here know where I can find replacements for the nylon headlight adjustment nuts for a 510? I took a look at a 521 several weeks ago and the nuts for those were different. I'm at a loss here. I've been looking through dozens of catalogues from fastener companies and none of them have anything similar to the 510's.