How do you replace the belt on a sears model 315.11751 belt sander?

push the front roller against a workbench this locks so you can remove belt.then take a pair of needle nose vise grips and lock on to the black steel bar near the end of it.put the new belt on.push the front roller against the workbench again and pull on the vise grips as you release pressure from against the front roller. this will unlock and spring out the front roller. might take a couple tries. good luck.poor belt change design.