Hi guys need help removing this part on my steering rack so I can service it. Any advice doing this without destroying it?

very carefully drill out the "punchmarks " unscrew the end pierce do whatever you need to and reassemble if the marks realign you can carefully spot weld the holes or re punch .

that is what we did on mine

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65 panel van Sprog
73 panel van Iggy

Use 2 pair of pipe wrenches. If it slips on the outer part (which is hardened) grind 2 flats on it on opposite sides.
I made a C spanner to undo them, but not worth that for doing 1 rack.

When doing back up, tighten until the tierod locks tight, then undo it 1/12 of a turn (no more) and tighten the lock nut back against it, firmly. Then stake the nut with a hammer + pin punch.
If you swap the old lock nuts L>R and vice versa, they `often' tighten in a different spot, so you can restake them.
If you need new locknuts, John Smidt and Karcraft both carry them.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.