Tom my buddy had his put together with the jam nuts and metal clevis's however with the vibration put out by the Saito 180 they came loose and unwound. The metal clevis's turn to easily to take a chance even with jam nuts .. I like the looks of Zippi's set up with the plastic clevis's . I think they would have less of a chance of undoing themselves. That's a very nice looking set up that I will keep in mind ..I will do that myself next time . Zippi is that sleeve made from aluminum fuel tube ?