I found a nice long handled slim adjustable with the black handle for a couple of $ at a junk store. The adjustment knob will not budge. If I hold the head of the razor, the handle turns with the knob. Doing this pushes the razor head up from the top of the knob. It is in great shape cosmetically and I don't want to ruin it, but I'm about to take a pair of pliers to this thing out of frustration. I've soaked it for days in scrubbing bubbles, doused it with wd-40, submerged it in boiling water and still no turning of the knob. Anyone know how to disassemble one of these properly or have a suggestion to free the knob? I only have three dollars invested in this thing, plus I picked up a near perfect slim adjustable at the same time for the same price. One way or another that knob is going to turn