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The Park Tool part number is 1088 it's the head and tube from the PFP-6 pump, it was $7.80 plus shipping in Jan-13
2 years ago on How To: Craftsman Cordless Inflator Dials In PSI To Presta Tires With Minimal Conversion
I opened it up with 3/8" drill bit it was a tight fit but went on with some encouragement. I got the XCP battery so hopefully it will last for ages.
What size did you open up the chuck to?