Rumb, I had that site bookmarked, but couldn't find it this week.

Aside from having that replacement diaphram, they've got the adapter hood for synchronizing...
https://www.dellorto.co.uk/shop/other-carburettor-injection-parts/kadron-keihin-nikki-pierburg-solex-stromberg-su-zenith/zenith-carburettor-spares/synchrometer-adaptor-zenith-inat-carburettor-01/

And they have the BK sync tool that I like...
https://www.dellorto.co.uk/shop/car-accessories/balancing-tools/synchrometer-airflow-suitable-for-sus-icts/

-CTH

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