It's really freeking easy.
Rebuilding a Curnutt Shock
no real special tools needed. A vice. a 32 mil wrench (used for old threaded headsets).
A couple screw drivers.
Motorcycle fork oil ( I used Harley Davidsion E Type. This is made by Showa and comes in at 2.5 weight).
Grease - I used Finish Line.
Mind the IFP depth. The good news is you can mess with this to fine tune your ride.
My suggestion to you is just do it! This is a very simple shock to rebuild.
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Thread: How To Rebuild A Curnutt