A long screwdriver, 10" will work, but even longer is better, more leverage. Tape up the tip with duct tape, slip it in behind the spider, push handle toward engine after removing belt of course. Now is when you need the "c". You can make one fairly easy out of 3/16" X 1" X 7" ? I have one that isn't wide enough to fit in spot where I'd like to put it, which is in the opening where you can see spider. Mine is 6" total length, but was made for older clutch and I haven't got around to making another one. I think 7" would work, with approximately 1.5 " feet.I see you have adjustable weights and these would be easy to carry and adjust your weights in the field. I've done this myself. I've also just used an old weight and slipped it into space between the installed weight and roller. Then you can work on other 2, then change old weight location to one of the finished ones and get the 3rd one. Maybe I shouldn't have told you that, just watch your fingers, be careful when you let off pressure on screwdriver. In fact I'd bet if you talked to enough of the A-C mechanics they could tell you a big variety of things they put in there to hold clutch in collapsed position. Even using a "c" you need to excercise caution, screwdriver could slip.