With a pattern to copy, that type of puller wouldn't be difficult to duplicate. The end with the expanding fingers would need to be case hardened to prevent the pulling lip from getting damaged, but that's a pretty simple operation with a torch and some Kasenit powder. The rest of the puller could stay flexible since it's held into place with the sliding sleeve. A slide hammer or a tapered jackscrew bearing against the end of the driveshaft could be used to do the actual pulling.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!