Magnetic Building Board Lever Clamp

Magnetic stand-off clamp for model builders that use a magnetic building board.

It uses common cabinet magnet latch magnets. Here is one source: https://www.allelectronics.com/item/mag-123/cabinet-latch-magnet/1.html

EDIT: 02/04/2018 The above magnets appear to be sold out. Regular ceramic rectangles will work too. A source is here: https://supermagnetman.com/collections/fer-rectangle/products/rect0750c-20?variant=29741050307

They are listed as "0.770" (19.56mm) long x 0.593" (15.06mm) wide x 0.118" (3mm) thick". Use two sandwiched together in place of the above latch magnets if you can't find the originals.

The arm is threaded for a M4 screw thread but there is enough material there to rethread it to any reasonable size. The lever arm slides into the slotted bracket. This setup can produce a lot of downward force.

See my magnetic building board 90 degree triangle brace here: https://www.thingiverse.com/thing:2540801