I had to go through the ordeal recently of repairing the blade height adjustment on my BT3000. The solution that I followed was to remove the shaft and gear, remove the motor, drill out the lug and install a wire coil threaded insert and reassemble. It is possible to do the repair without removing the motor assembly. I tried that and eventually had to redo it. Removing the motor will add work but makes the repair process on the lug much easier. This file details the process I went through.
Blade Height Adjustment Rebuild Instructions
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