11-11-2012, 01:14 PM
Progress, or even success!
I removed the old rivet using Lawrence's 'solder' method - worked fine, although I was a bit nervous about putting pressure on the wafer.
Next fit a new contact. I tried to do it without slackening the switch but couldn't manage it. So I removed the knob, nut and washer and eased the switch backwards, then slackened the nuts on the switch to allow a bit more access. After about 15 goes, including destroying one contact, I managed it. SWMBO's old eyebrow tweezers proved invaluable. My tweezers are in there somewhere I'm sure. I put a dab of nailvarnish on the threads to lock it. Then it was just a matter of reassembling and reconnecting the wire. The wires are pretty thick so a bit of careful dressing is called for to reduce the load on the contacts.
And it works. I'm a bit dubious about putting 10W through the contacts, but Marconi thought it was OK.
I'll have to do some more tests in a bit, but I've got a few other things to do first.
Alan
I removed the old rivet using Lawrence's 'solder' method - worked fine, although I was a bit nervous about putting pressure on the wafer.
Next fit a new contact. I tried to do it without slackening the switch but couldn't manage it. So I removed the knob, nut and washer and eased the switch backwards, then slackened the nuts on the switch to allow a bit more access. After about 15 goes, including destroying one contact, I managed it. SWMBO's old eyebrow tweezers proved invaluable. My tweezers are in there somewhere I'm sure. I put a dab of nailvarnish on the threads to lock it. Then it was just a matter of reassembling and reconnecting the wire. The wires are pretty thick so a bit of careful dressing is called for to reduce the load on the contacts.
And it works. I'm a bit dubious about putting 10W through the contacts, but Marconi thought it was OK.
I'll have to do some more tests in a bit, but I've got a few other things to do first.
Alan
