A note. I bought a couple magnets from a fellow a couple years back. Never showed, he refunded me and got insurance from USPS. About a year later an envelope was delivered to me with the magnets. The envelope stuck to my refrigerator. Lesson, put padding around these things. I think mine were stuck to a conveyor for a holiday
If I put a tin disk on the business end of the last one in the stack, I should be fine. I know small magnets I get from CMS Magnetic as always in a box that's way too large. maybe they know something.
Now if I could get Mouser Electronics and B&H to use more conservative sized boxes...
In the old days I worked for a division of Raytheon, we manufactured industrial and commercial microwave products. The magnetron magnets are a dead ringer for the Jobo units, of course minus the molded plastic part.