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I had a similar issue I couldn’t get it removed with anything until I used this tool I found on Amazon just be sure to clean the cylinder with some degreaser Duramont Office Chair Gas Lift Cylinder Replacement - Universal Size Fit All - Heavy Duty - Includes Removal Tool, Instructions & Gloves https://www.amazon.com/dp/B07VZYK29P/ref=cm_sw_r_cp_api_glt_fabc_GY8NF02DMDJEXNHWXAVX?_encoding=UTF8&psc=1
I used the tool that comes in this kit (I couldn't find the tool by itself, but it worked great and I now have a replacement piston). As for the tilt lock tab, you should be able to transfer the gear from the old mechanism to the new one and then the cable will be compatible. Let me know if this works.