Nigel
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Different thicknesses is no issue, in fact it can be good to have a thinner magnet on the device and a thicker magnet on the mount since then there is less need to remove the magnet from the device when you are using it for other purposes. The pull is then approximately the total of both magnets, so if you make one thinner you should make the other thicker to get back to the original combined pull.Can you retain the self centering ability of disc shaped magnets of different diameters/thickness, like 20mm x 3mm thick on bottom and 12mm x 5mm on top. This is just a hypothetical question I was wondering about ?
I ordered the following disc magnets from http://www.banggood.com/ :
15mm x 3mm
20mm x 3mm
12mm x 5mm
20mm x 5mm
This covers a varying amount of pull force from about 5 lb to over 18 lb .
You guys better get a Flu shot, this stuff is really messing me up!
Different diameters is not so good, if there is a big difference then the narrow+thick magnet will have a more concentrated pull which will be sufficient to create enough friction that the centering effect may not be able to overcome it so while it will still ensure that it is close to the right position, it may not centre it exactly. It is best to match the diameters.
Be careful with multiple 20x5 magnets, or they will eat your fingers. I suggest you put a layer of duct tape around them while you play and maybe leave it there when finished, if not then wear some eye protection just in case you shatter one.