hi Syl...when I did mine I just cut the excess that I did not need but still maintained the locating pin position on the upper joint...I think I would go for 50/50 but also bear in mind the clearance issue where the extension passes "U2"
if you use at the max limit (triangle bit) then it will put the extension very slightly closer....I used 19mm tube ....I think anything thicker may conflict with U2
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