So I am still somewhat confused here.
I have a 2012 Tandem Island. I am having the same issue with the furler drum resting on the bearing race ring. It causes considerable resistance and I have wear similar to what has been shown above. I think I have read through all of these posts but am still unsure. On my boat the hull is pushed outward on the bottom slightly by the V brace. It would seem that there should be a way to adjust the V brace to gain more clearance for the mast and reduce the pressure placed on the bottom of the hull by the V brace. Do I need to try to adjust the furler drum instead?
Adam, do not attempt to adjust the V-brace to move the furling drum higher (although your particular TI might already have too much tension on the v-brace causing hull distortion, caused by someone (the dealer?) erroneously trying to lessen the rubbing of the furling drum).
As I stated above, on the TI (and on V2 versions of the AI mast base), the mast receiver is bolted rigidly to the crossbar, so changing the length of the v-brace can only affect the depth of the mast receiver by distorting the assembly, which is NOT good.
You should take your TI to your dealer, and if they suggst increasing clearance of the furling drum by adjusting the v-brace, politely inform them that Matt Miller, David Ketterman (designer of the Miragdrive) and Steve Fields (CEO of Hobiecat Australasia) and others have all stated that adjusting the v-brace is not the solution (for more than a tiny amount of variation).
Correction is without doubt a warranty issue.