The problem with rebuilding one is that the dealer does not sell the kit anymore, not to mention if was pricey to begin with. You can order an aftermarket rebuild kit from RockAuto
for approx $70. A detailed rebuild procedure can be found here
You will need the passenger side mounting bracket specific for the manual rack. To my knowledge that part too has been discontinued by the dealer. Your only chance would be to find one in a junkyard. Alternatively you could either build the bracket yourself or add some rubber spacer around the rack to reach the correct diameter.