Here is the official description of the purpose of the 5th shock absorber taken from the 21st and 22nd series fact books. Since there is not a core charge as Merritt usually has for anything rebuildable I don't think they can be repaired.
Some years ago someone came up with the idea to cut off the old shock and modify the rod assy so a Pinto rear shock could be adapted and installed on the rod. Don't know if anyone else ever tried it or how well it worked. No idea who or where the idea came from to give credit.
Attach file:
shock.jpg (263.80 KB)
22nd shock.jpg (79.87 KB)
5th shock.jpg (50.40 KB)
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