Dit antwoord gekregen... nou de experten spreken elkaar tegen, lijkt me, en deze meneer spreekt zelfs zichzelf tegen; extra magneetjes doen niets, je kan evengoed in het midden een sterkere magneet stoppen (wat dan wél iets doet?).
Stuurt ie me gewoon met een kluitje in het riet of wat?

I’m afraid we no longer carry the smaller sized spacers sadly. We did, for a very long time, have 3mm Alnico 2s, 3s and 5s – and they sold pretty well – but they didn’t really do anything (you might as well just replace your small central bar magnet with an Alnico 8 or a ceramic – it’d be cheaper, and its doing, near enough, the same thing (more magnets = more mass, more mass = more strength)

Working with oversized ceramics, its handy to be able to fit “bigger” – so the spacers do make a difference – but with smaller sizes and Alnico grades – it just ends up sounding like a normal ceramic either way really.

Sory about that
Craig Jackson
Axesrus