Replies

1. 
   RalphBarker | Dec 11, 2011 06:13pm | #1

   As I recall, the cups have a countersunk screw hole, allowing the whole thing to be removed, if needed. There may be some "magnification" of the magnetic field, as well. Simply gluing the button into the wood should work, too - assuming there isn't too much seasonal movement. But, you're talking about a small section of wood, so I don't think there is too much to fret about in that regard.

1. 
   JerryPacMan | Dec 12, 2011 08:16am | #6

   If you screw the cup to the wood you will not remove the cup once the magnet is inserted.

2. 
   KWesenberg | Dec 11, 2011 07:53pm | #2

   cup or no cup

   I agree, as advertised, putting metal behind a rare earth magnet incresses it's magnification. Other than that, the washers just make it easier to reverse and recover the magnet.

3. 
   BruceS | Dec 11, 2011 09:14pm | #3

   The metal cups are a very good idea,  If the rare earth magnets set slightly below the surface in the cup.    Rare earth magnets are some what brittle and I have had them break if two of them slam directly  together.

4. 
   Julimor | Dec 12, 2011 04:54am | #4

   In my experience with rare earth magnets it seems the cup adds to the magnet's strength. 

   Yes, it is easier to install and it can be easily removed.  However there have been times the piece the magnet is holding takes the magnet with it, out of the cup, when pulled away. 

5. 
   Quickstep | Dec 12, 2011 07:28am | #5

   So, the magnet is not held into the cup by any mechanical means?

1. 
   RalphBarker | Dec 12, 2011 10:23am | #7

   mechanical attachment

   "So, the magnet is not held into the cup by any mechanical means?"

   Nope. Not needed.

6. 
   robk | Jan 24, 2022 01:26pm | #8

   5 min epoxy works without cups, and the disks are easier to remove this way. Removing them from the cups requires breaking them into bits / dust by drilling them out, if you haven't filed a lip for a screwdriver on them first.

7. 
   _mj_ | Jan 24, 2022 02:31pm | #9

   Pre-drilled & countersunk ring magnets:

   https://www.kjmagnetics.com/products.asp?cat=15

8. 
   elmaduro | Jan 25, 2022 09:15am | #10

   Personal preference, but I think cupped magnets just look better.