Hi fellow discoverers,
I have a habit of scrounging all sorts of stuff off the curbside refuge and when I discovered printers had a selection of real neat steel rods in them I accumulated quite an inventory of materials. It's great fun harvesting from old printers because they're all different and you'll never know what you'll find. Came across a couple of laserjets, can't remember what brand they were but discovered long magnets which sat on my magnet wall for quite a while, apparently they were from the magnetic roller inside the cartridges. Other neat stuff includes rubber rollers attached to steel rods which would make great belt grinder wheels. Anyway, saw people were making their own swarth tools, yep need one, spotted salvaged magnets on shed wall, located the aluminum tubes they came in, glued a knob on the magnet, whacked a rubber guard on one end of the tube and blocked off the hole.
I made the thicker one first, 12mm but wouldn't fit between milling table slides so made the thinner one, 10mm.