If you are going to work on this or other belt-drive SBs from time to time you might want to make a tool for dismantling this clutch (same one will fit the reel's drive pulley by the look of it, but you'll need a different sized one for the engine pulley). Just find or cut a piece of quarter or three-eighths inch thick steel plate about 2" wide and a foot long, drill two holes in one end exactly the right distance apart, and weld a couple of pieces of steel rod (or bolts with the threaded part cut off)into the two holes so they stick out the right distance to reach the bottoms of the holes in the clutch. Use the biggest rod that will it into the holes in the clutch, and make them a close fit in the holes in the steel plate. Weld them on the back of course, not on the side that has to fit flat against the clutch. The tool you make will look like the standard tool that comes with a big angle grinder to change disks. You might also put a pair of holes and pins in the opposite end of the tool, to fit the engine pulley.
And don't forget Bruce's warning that the clutch thread is left-hand.
