I own one of the old green Powermatic 143 band saws and for the few years I've owned it the saw has worked great. I've used low gear for steel and flipped to high gear and blade change for woodwork. I love its versatility! It's been in high gear for about a year or so and recently went to switch to low and it simply will not go into low gear. I rotated the pulley slow, fast, and in both directions. It will pop out of high and go into neutral easily and then pop back into high gear just as easy, but nothing will make it go into low gear. Short of draining the oil and opening the case to look for broken parts, does anyone have any thoughts or have had this issue before?