Bike is a '05 EX500. I pulled the slack out of my chain for the first time ever and found the axle pulling bolt on the right side to be incredibly sloppy and doesn't really do the job right. I tightened the axle and think it's on straight but I'm having a hard time telling for sure. I've read about a string technique and I tried to replicate but again I don't think I was doing it right. I know there are a couple tools available for checking the how straight the chain is which will inform how straight the rear wheel is or vice versa. Any recommendations on one of these tools are a good demo online for how to do the string test? I'm going to have to take it into the shop if I can't figure this out, and if it's anything like a pedal bike chain I'll be in the shop a little too much for such a simple piece of maintenance.