Realising that the sharpies sold in my local 'partners' shop were different I decided that I would purchase two and see what I could do.
And this is what I did:
1. I purhcased two magetic pick-up tools (look like aerials with a magnet on the end) - I used 2lb version which cost 75 p each.
2. I separated the pointy (black) end from the grey and then cut the ink tube off so that it was just shorter than the black bit itself.
3. I used a small plastic cap, the diameter of the black bit and then poured a little epoxy resin (araldite, lock tight, etc.) to seal that.
4. A magnet was inserted into the black end (flush with the end and more epoxy poured in.
5. I filled the grey end with foam which was capped with some more epoxy and finished off with another magnet in the end (NOTE. Make sure you have the polarities right or else you will have an amazing separating sharpie
).
6. The whole shooting works is finished by adding a shim of thin (black - paint it if you need to) pastic and trimmed. When together you can't tell the difference. The magnets are so strong they can stand casual examination - and both pens works.
Of course you have to do the work yourself and you could get ink on your fingers and the whole thing cost me £8. 50 to do (I had the epoxy resin lying around so haven't ibcluded this in the cost) so it's not all bright and sunny
Vic