Details:
I've acquired an APE Microball height gauge but found that the scriber head seems to have lost the detent that engages with the gaps between the column balls when adjusting height.
I'm at a loss as to how to dismantle the scriber head - there are 3 small pegs at 120 degrees around the 'knob' end of it which I assume need to be extracted to start the process but no obvious way to do it. Web search has not produced any data and the firm is no longer trading.
Does anyone have any info on these or any parts diagrams that might give a clue? Any help would be greatly appreciated.