Hey guys, I have a 2012 rmz 250 that broke a tooth on the rear sprocket. I got the wheel taken off, was able to crack 2 nuts loose, but the other 3 seem to be rounding off the bolt. I used just a normal 12 mm wrench to crack them loose. With the other 3, I tried the 12 on them, and it would start to slip and round the bolt. I’ve tried adding wd40 to the threads and head, still no budge. I’ve tried adding heat, still no budge. The bolts are also snuggled against the spokes, so it’s hard to fit vise grips in there. I can send pictures, but if anybody has advice please help!