Mike the dust seal is very simple as shown on the parts drawings I have.
It is nothing more than I assume a strip of felt or possibly leather that runs around the outside bottom of the turret. It has a metal band on top and is secured by a clamp which looks like an oversize hose clamp. The turret is held in place by 5 or 6 internal brackets bolted to the turret and goes under the ring. They turn with the turret and it's all covered by a angled styled capping. I am so fortunate to have great drawings thanks to members on the forum here.
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