explanation on why 2 more lbs on the cross. here i offer an explanation why we need 2 more lbs on the cross string. actually quite trivial and i wonder why no one has brought it up. the first pound. let imagine the situation in which we have a good 6-pt machine. we weave and tension mains string first, and then we weave and tension the cross string. when we tension the main string, the strings are a straight line when tensioned. without loss of generality, let say we first tension the mains to 20lbs. then we weave and tension the cross at 20lbs. notice now that after the tensioning, the mains are no longer straight as they are weaved with the cross. the result of the mains being displaced and since the frame isn't moving, the tension will have to go up. by how much is anybody's guess, but my guess would be say 1 lb? now, if the mains goes up by 1lb, then we have to increase the cross tension to 21lb to compensate for the difference. the second pound. i believe if we have good support, 1lb or so is all we need. many have said that if we have a machine with no support, we need 2 pounds to compensate the distorted frame. i think that is a legitimate argument. collorary: what else can we find from this? well, one observation i can see is that, if we tension, eg. 20/22, the resultant mains tension is actually higher than 20. and imho, more like 21 or so. does that make sense?