I thank you fellow members for your gentleman and scholarly replies. Amidst my confusion at the SM description, the 15 p (pressure) is the key to the 'STOP" malfunction..........Page 18 JPEG
In brief after the 1st reply to my query, further examination and tinkering has revealed that the 15RL1 relay is activated via PAUSE +/or STOP. PAUSE is engaged by one side of the rocker switch and this has no problems as the clearance between C and D contact springs falls within 1 mm.
The STOP function doesn't always engage because as the rocker swings to the other side of the 15RL1 relay, the plastic lever that disengages the tonearm doesn't travel far enough (just a tad short). I witnessed this as I had the bottom cover open with the BG3404 suspended. With a very minute nudge on the plastic lever, the STOP process completed it's cycle.
Conclusion: the C contact spring must be bent forward (more pressure) in order for the plastic lever to swing outward just a tad more and 15 p is what is required !
I'm not sure that I'll arrive at the correct P or Newton force however "direction is not important, results count'!
Thanx for your enlightenment and humour...Regards, ICE π