Don't rely on oil to lubricate the waste gate... it's WAY too hot in there and no oil will last. Use a HIGH QUALITY penetrant to CLEAN our the hinged. Work the hell out of the hinge while keeping it thoroughly saturated and periodically flush it out with more.
I hadn't realized that OEM CT-26 waste gate actuators could be had as inexpensively and the OP found... last one I had to replace was for a monster Turbonetics and ran about $150, IIRC.
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