I can supply the upper tube assembly P/N: 21707-000; these have become scarce in serviceable condition. The sheared turn stop can be repaired, there is an FAA-approved shop in Wisconsin providing this service. I usually have their repaired tubes in stock, EXCHANGE ONLY, on repairable cores NOT CRACKED.
I have 12 cracked cores, Webco Aircraft says they have 25 of them. Someone has to step up and make a repair available, probably the owner-produced type.
These holes were damaged from inadequate torque on the old-style AN3 bolts. One cause is from paint thickness fretting, a thin coat of primer only is allowed between mating components [this applies to multiple applications]. The NAS bolts, which are high strength, associated with SL-596A will help avoid this situation.
Fixture to properly tap for Heli-Coil inserts
The bushing for the steering damper P/N: 452-379 [old 21835-004] is typically worn, the one in the photo is cracked. I have these in stock; note the bushing must be reamed to 0.250″ after installation.
Also note the loosely-installed torque link bushing, these [in pair] will need to be replaced and reamed to 0.3125″ also.
Sheared turn stop weld repair
Repair of sheared turn stop, awaiting torque link bushings installation and reaming
Example of cracked tube 21707-000
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