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[DrMike]

Plastic gears, even worm gears, are readily available.
Pick a source, find your gear, pay for it and wait for delivery.

Stock Drive...

[DrMike]

Your Sherline moves the cross slide the number of graduations.
Therefore you'll reduce the radius by that number, or the diameter by twice that...

[DrMike]

As asked above, does it have compression?
If so, put the old piston back in and see if the engine runs.
It could be an issue that has nothing...

[DrMike]

I have sent several guns to manufacturers for warranty and repair work.
Ship via UPS directly there, the manufacturer ships the gun directly back...

[DrMike]

You are correct, the chamber is cut too deep. The case head should be very slightly below the barrel hood. When your gun is fires, it's because the extractor...

[DrMike]

This would be a great post for the Shop Made Tools thread.