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What jeffers said.As has been pointed out you can only use builder approved/supplied blocks for the 2 blocks on the boom and the traveller block assembly.
You are free to use any flavour of mainsheet block that you want though.
I understand If my post was a little bit misleading. I was saying that you cant use other blocks on the boom or the traveler to upgrade the purchase system so trimming is easier, i assume most people know they can't replace the traveler and boom blocks. Sorry for the misunderstanding..What jeffers said.