I purchased your kit back in December 2017. Due to personal issues, I'm just now getting the engine and carb together. Everything with the carb has gone well, thanks to your book and the parts you supplied. Throttle bushings are in and all mods are done. Just as I was getting ready to install the APT adjuster, I realized the threads are knurled up on it. I was able to get another, thanks to a spare carb I have, but I want to chase the threads in the carb before attempting to install it. Would you happen to know what size tap I need? Carb is 17058240. Thank you.