Ralph, Old Pulling magnet 15s have the magnets in series for 60 Mils. My holding magnet 15 has a 60/20 mil switch on the side. Tom N3CRK -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20240310/76293c2e/attachment.html>