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I have Myson radiators that were installed in 1997. The radiator bleeders are much smaller than modern ones; about 6mm diameter, with square drive. The boiler is a Potterton Suprima 60, I think that means I have an open vented system. The TRVs are Myson but are a special intermediate version...

I have had the usual problem of the radiators getting warm when HW is on. I have read other posts on this forum including the FAQ: Mid-position valve working and Diagnostics. I have removed the actuator from the valve but I have not yet disconnected it. I am a bit reluctant to do this...