The Redux uses a standard Phantom hammer.
With a 6.25 inch barrel, the Redux needs a
strong main spring to achieve usable velocities, suggesting hammer bounce.
I've been looking for a lighter weight hammer to use in the Redux to reduce hammer bounce and tune the marker's efficiency.
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The original design for a fluted Nelson hammer is credited to Colin Thompson of Lapco.
An idea for milling a standard Phantom hammer was posted on PhOG here:
Initial review of fluted hammer
The linked page in that thread is down but I'd previously saved the images:
Stock Phantom hammer, 43.7 grams Milled Phantom hammer, 29.0 grams Hammers, side by side comparison
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Courtesy of a friend with access to a machine shop:
Scale, tare weight 0.0 grams. Stock Redux/CCI Phantom hammer, 43.2 grams. Milled Redux/CCI Phantom hammer, 29.1 grams: 
EDIT - posted results below and I'll call this a success, pending longer term reliability testing. Attached are also some photos of original, fluted brass Lapco hammers, courtesy of my Nor.Cal Nelson friends.
