opps missed this, Stumpy, that helmet mount link I posted above is for the old design magicshine units, is you need a new one you’ll either have to hang onto until DX stocks them or buy one from spokebloke.
Jonb, it’s worth bearing that in mind too, as the o-ring is ok but not exactly brilliant (I find it starts to slip round the bars when occasionally)
Luminous, no i’ve never had any issues with heat on the MS unit’s, & mine has never had any.. would the re-design be for purely ‘cost’ of making the new shape vs the old (less machining required so cheaper?)