I've heard folk say they've done this online, but have never seen a 'how to'. I figured I would document my process for anyone who has considered it, but didn't have the confidence to have at it.
This Freddy was missing all three blades. Fortunately I found a busted blade in the bottom of the cabinet to gauge by. I decided to go with craft sticks.
My tool of choice is a dremel. I have a nice corded dremel with the flex head attachment...but that thing is a cumbersome beast. I decided to invest in the $20 cordless Dremel model for its compact, light weight design and 'grab-n-work wherever you happen to be standing' convenience.
Step #1: Prep the glove
I don't know what other people have done, but to me the best course of action would be to completely remove the old blades and create a slot for the new ones. This would give a very solid connection and add to overall strength.
To do this I used a cutoff wheel to remove whatever was left of the protruding blades. Then I used a barrel sander to grind down the blade tops on the fingers. Finally, I used a thin cutoff wheel to hollow out where the blade will go. Popsicle sticks are almost exactly the same thickness as the original, so you have a built in template of where to cut. I went to the same depth as the original blade goes on the tips of the fingers.
Sorry for no progress pics here, but I did all this work before deciding to document. Sometimes I get a wild hair and accomplish more than I plan on in a sitting.