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Sorting through my boxes of plumbing bits I found some of my brass 1/2" & 3/4" (15/22mm if you like!) olives had two narrow grooves cut round the outside. It seems that the purpose is to allow the olives to compress more easily as the compression nut is tightened. I've had a look in various...

[After a further search this query may be more appropriate to this Forum] The spark generator PCB in our hob is an APCO 16440 from 1998 and has an isolation transformer between it and the mains and an earth connection, plus the four EHT leads to the burner electrodes and four wires to the...

The spark generator PCB in our hob is an APCO 16440 from 1998 and has an isolation transformer between it and the mains and an earth connection, plus the four EHT leads to the burner electrodes and four wires to the corresponding knob microswitches with the common back to the transformer...