I need some feed back to understand why the distributor on my 1929 AC International Chevy moves while cranking it over?

I have not removed the distributor but did check the timing at 12 degrees tdc on the compression stroke.

Essentially, I adjusted and cleaned the points and now awaiting an ignition tune up kit.

I noticed there is a spring attached to the distributor and the fuel pump. It was pretty stretched out and have not seen a spring set up on a distributor like this before until now. So, I have removed it and not replaced it.

I took off the spark control linkage to make sure that the there was nothing affecting the distributor.

The only cable to the distributor is the electrical lock ignition cable.

Baffled and need help on solving this problem!!