Here is a simple tweak to increase the efficacy of Cappelletti/Hamilton in the pass-out seat – use Double to show the one-suited hand and 2C to show both minors. When you are in the balancing seat, after passing originally or even as a non-passed hand, you almost never will want to make a penalty double of a strong 1NT (or even after a weak 1NT when you’re a passed hand). If you have already passed, you obviously couldn’t have a penalty double all by yourself and if you are a non-passed hand and your left-hand opponent has opened a strong 1NT, his high-card points would be right behind yours  – and besides partner wouldn’t have a clue as to which suit to lead. So why use the double for a bid that you probably would never make – a penalty double?

A much better usage for the double in the pass-out seat would be to use the double to show a one-suited hand – instead of using the regular Cappelletti/Hamilton 2C bid for that purpose. Playing this would enable you to play in clubs at the two-level instead of the three-level. Using the double for the one-suited hand would also free up 2C to show a two-suited hand in the minors and enable your partner be able to pick his best minor at the two-level – as opposed to having to pick his best minor at the three-level over 2NT, using standard Cappelletti/HamiltonSince you would virtually “never” double 1NT for penalty in the pass-out seat, using it for another purpose has got to be an improvement. The meanings of 2D, 2H and 2S would still remain the same as in standard Cappelletti/Hamilton. 

Here is Balancing Cappelletti/Hamilton in the pass out seat :

• 1NT-P-P: (Exception: in 4^th seat after a weak 1NT opener and you are not a passed hand, the double should be for penalties).
• Dbl:    Shows a one-suited hand; partner is asked to bid 2C – then the doubler will pass or correct to his suit Your partner might also choose to pass the double with a balanced opening hand or better.
• 2C:      Shows both minors; partner should pick his best minor fit by passing or bidding 2D.
• 2D:      Shows both majors; partner is asked to pick his best major fit at the appropriate level.
• 2H:      Shows Hearts and an unknown minor; your partner is asked to pass or raise with a heart fit but with heart shortness and support for both minors, he should bid 2NT, asking for your minor.
• 2S:      Shows Spades and an unknown minor; your partner is asked to pass or raise with a spade fit but with spade shortness and support for both minors, he should bid 2NT, asking for your minor.
• 2NT:   Shows a very strong minor 2-suited hand, looking for game, even after a strong NT.