Toadster,
Yeah, and I got myself thinking too. There is nothing shown for the long end in the catalog. I haven't pulled one apart to see, but I think maybe the rack gear just rides in the machined housing. If this is so, and you wear it (the housing) down, the only solution would perhaps be to have it bored and fitted with a bush which would then be honed to size. I see there are rack gear and pinion shaft sets available, for almost $800.00!, but no housings.
Folks, keep your boots in shape and you rack lubricated! (w/90W)
Motorbill
From Lola to Land Rover, If it's British and has wheels, it's likely I've bloodied me knuckles thereupon