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Rebuilding old shocks…something I used to do.
As above stated by Brent…
It is impossible (or near)) to find decent cores anymore.
There are 13 wear points inside a shock. Each surface is mutually dependent on the other surfaces. To weld and/or machine down 13 surfaces is really cost-prohibitive. And nigh impossible to get good tolerances back.
If one finds a “decent” shock with minimal wear, heavier viscosity fluid may be added. However, the shock action will not be exactly as original and cold weather might play havoc.