Replacement air hose crimp ferrules found at hardware stores and automotive supply make excellent ferrules for damaged or making new wood handles. There are several sizes to choose from. Anyplace that repairs and fixes air hoses should have them. These were $0.75 each.
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I found these at Ace Hardware. I slipped them on until I had one that was a nice tight slip on fit. A little J-B Weld to secure everything in place within the wood. Best yet was that the front hole was sized just right to conform easily and no need to drill!
They may be a little long (about a 1/2" longer than the originals), but I like the little extra length in the handles now. Plus the ferrules have a nice little taper at the edge that matches up to the wood. One could cut them down to length if desired.