how do i bore my tb?

 

Put it on a metal lathe, with a cutting piece slowly work your way in and out of the throttle body making small increases each time. then taking a polishing piece and make it smooth. took me about 15 minutes for disassembly, to bore it out and then reassembly. The lathe made it to where it was perfectly round as well. And with everything stripped off of it it was well balanced