Cap'n, if your '73 has a stock bushing in its rack, without a doubt it is shot. Stock bushings were made of a steel case lined with neoprene with a bonded plastic bushing rubbing the steel rack-gear, and most did not survive 15000 easy miles. Likely nothing is left except the steel case and a thin steel shim-washer. You can verify this by jacking up the right front tire, reaching up and grabbing the steering shaft and pushing up hard. If the steering rod moves up any amount near the aluminum rack-body, the bushing is worn or non-existent.
To clear everything out, the rack will need to be removed and almost completely disassembled, so a long rod can drive out the steel case and washer. Instructions are on www.Panteraplace.com website, or some vendors do a mail-order trade-in, supplying a rebuilt rack for your core. Call around.
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