i just got a kartboy shifter and blox 490 knob, but it wont thread all the way down. its only threading on about 1/2", 3/4" tops. looked at the threads on the shifter and inside the knob, and both look fine. Yes, it is M12x1.25 (as far as i know. couldve been boxed wrong i guess, but then i doubt it would thread as far as it does.) Any idea what the problem could be, and do you guys have any way to fix it if it's not just something stupid?