I had to make my own flywheel puller for my STIHL chain saw
when I tore it down to rebuild it last winter .
That tool worked like a charm and is definitly staying .
It reminds me of a spring compressor used for those squirrely springs in door hinges....
That's an interesting guess. The jaws expand and could compress a spring against something (spring retainer maybe?). There is a ratchet involved that holds the jaws apart. You couldn't actually compress a spring between the jaws.
The spring compressor that I have in my box has a bolt through the center and tightening the bolt compresses the spring. It is more useful for installing door springs. here is a picture:
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