I'll take a look, but I don't have an on-board compressor. But I also think the issue is not in the actuator, but rather in the mechanism. I think mud/water has corroded it over time.If you have a compressor why not use the Evo No limits air disconnect? It's pretty handy being able to disconnect in 2wd and at speed on backroads
They are easy to take apart and clean. Mine was locked up when I bought it, disassembled, and cleaned and repacked with grease to prevent it rusting again.