[svantel]

Hi Graham

The magnets I used had a normal magnetization, on flat side S and the other side N, it's impossible to put them together the "wrong" way.
I bought it from an Swedish site, magnetvaruhuset.se, but I'm sure there are many sites that have similar magnets.

I didn't glue them either, the stuck really hard, so no risk of unwanted movement as I see it.

Br Svante