On my second build, I have a blade holder and a choke that will no longer screw together. They screwer together perfectly until I put in the heat sink and then it became very difficult to screw them. Like an idiot, I forced them to together even as they were grinding. Now they will only screw about halfway down before stopping and getting stuck. I could see the the threads had been ground some so I smoothed them with a dremel. I tried wd-40 and also a little bit of vaseline, neither of these helped. I dont mind the screws being exposed aesthetically, it looks kind of cool, but if they don't screw all the way down the heat sink is loose. Anybody have any ideas on how to fix this????