Ive actually safety wired the TPS in place when I didn't have the clip on MC28.
You should be able to fab some kind of tab by looking where the retaining screw goes, and the slot in the TPS body is. I made one out of some spare flat aluminum and it worked okay. It's basically a C shaped bracket that goes around the TPS and holds it in place. Just get some flat aluminum and a rotary tool and you can knock one out in a couple minutes
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Charles Gallant