I rebuilt two SX 50's during this past Christmas and didn't need a thrust washer puller.

The drive washer must come off first because there is a Woodruff half moon key under the drive washer. This key must be removed or you cannot get the crank out. There's a little washer between the key and the front bearing that you do not want to loose.

Heat the engine up in the oven just under 300 F and you bang the back of the crankcase against a 2 X 4 to shake the crank out.

Enjoy,

Jim