Rotary Table Spigot Locking

[redmog]

Ideas invited for locking the centre spigot on a rotary table.
I can never clamp down with the centre spigot on the rotary table because it will rotate and also pull upwards as it is not affixed to the table.
Therefore I end up bolting to a sacrificial length of BDMS, seems to be a regular waste of material.
Have I missed the obvious?
Example shown below.

[weldsol]

Can you not put a radial slot on the centre piece and clamp via the spare tee slots.

Paul

[houstonceng]

Redmog

My RT has an MT3 taper for which I made plugs which are tapped at the rear. A suitable (home made) shouldered "washer" and socket-headed cap screw secure these from the rear of the table and still allow it to be laid flat on the mill.

Each plug serves a purpose such as "centring", "clamping", etc, by dint of a centre or tapped hole in the "front" end.

Andy

[redmog]

Paul - Thanks for the reply.

Andy - Thanks also. I'm still thinking it over, I'd thought of your idea but it means machining the base of my Rotary Table. Not an easy task on a Myford Seven ! or anything larger for that matter.
More ideas still welcome.
Chris