[brenellic2000]

The 10-1/2" was available with the last 'gold' Mk.5.

Brenell never made stacked 'stereo' heads, only ever half-track mono (not sure if they even offered a full track of their own. They were not head-makers per se.

As a former Industrial Engineer, the reason why women were employed is that they have the canny ability to tolerate monotony by 'switching-off' (which men don't) as a result of maternal instinct; thus reducing the risk of strikes. It has nothing to do with politics or 'feminism' (whatever that means). It's a simple fact of life!

Daphne was not interested in stereo - the staggered stereo separation allowed her to experiment to the full; her archives survive... but when I was researching themI was only looking for her Oramics work... and Brenell were not 'officially' involved.

I am sure mica and suitable thin metal laminations/shimming are still readily available from specialist engineers' factors. All you need is a fly-press; a well hardened and engineered set of dies; a large vice and Evostik and some drawn head-block blanks.... but most went over to the vacuum deposition method... and tin of Elbow Grease! It all depends on your interpretation of hi-fi.