The flat wrench adapts to the torque wrench at a 90 degree angle, belt adjustment and axle nut torque can be done quick and easy with it, no socket is needed and you wont have to pull the mufflers. It is the right tool for this job.

 

The flat wrench sixguns suggests is great. My struggle has been keeping the fixed nut from rotating when applying the final torque. If it moves, the adjusted deflection is lost. Usually my wife is my able assistant, using a breaker bar and 36 mm socket on the fixed but. Been thinking about getting "3d hand" nut locker like Jims sells, but $54 is ridiculous. See .

 

I just came back from the garage to order jim's 3rd hand and this thread came up. 54$ seems less then it was b 4? and better then tying nylon belts and a half dozen other ideas

 

Actually if you buy a big adjustable you can leave both slip on's on, and with one tool mentioned above, crack the nut loose and adjust as needed.

 

One thing I have learned with both bicycles and motorcycles is get a good inch pound and foot pound torque wrench and use them. I run heavy equipment for a living and the "tighten it as hard as you can" rule is the standard. Bicycles and motorcycles don't stand up to these rules very well. If you don't strip the threads, it'll be too loose.

 

I use a 80 or so year old monkey wrench !! Tighten until it feels tight, barely able to twist the belt 90 degrees.