I have a Leyland Mini Tandem brake master cyl set up complete. Should I use this on a round nose or use the original single set up.

I'd not use the tandem one unless it's a late Clubby.
They work no better than the single ones and are harder to rebuild.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

What he said ^, the single circuit one doe give a better feel and as for having two circuits so that if one fails you have another, well on these it don't work, loose one, you may as well have lost both.

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