Thermo quad bogging badly when stomped on

Here's the tool. It's a T handle with a hollow handle. It had a ring on the end with two tabs to engage the lock ring. You insert a flat screwdriver into the hollow handle to hold the inside adjuster to keep it from unloading while you loosen the lock ring with the tool. It's a nice tool, but I never have needed one.

Thermoquad Air Door Adjusting Tool