Tanner tilting table saw question

One of the projects I've got going at the moment is getting this 1950 Tanner tilting table saw running. The machine is in pretty good condition and hasn't seen much use so I'm not stripping it right down and painting it, just giving it a good clean. It's got a nice mitre gauge which I will re-paint and give the engraved scale a polish.

However, the rip fence is missing a key part. The fence runs on a round steel tube bolted to the front of the table, but I don't have the locking mechanism and I'm not exactly sure how the lock would have worked. There's a casting that wraps around the tube, and a hole through the casting perpendicular to the tube and offset to the bottom of the tube. I'm thinking there would have been some sort of either wedged end on a bolt with a knob at the front that drew it forward to lock against the round tube, or maybe a cam shape on the end of a shaft that got twisted by a lever to lock against the tube.

Does anyone have any idea what the locking mechanism would have looked like, or can anyone point me to how other fences running on round tubes achieve the locking action?

Thanks in advance,
Graham.

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