thought id bring this post alive... been looking at vgroove bearings... mmm ebay is the cheepest really. the site above is good but want silly money for the postage from us... now on ebay same price around 90 quid.. but only 10 dollers or so for delivery... patio door rollers cheap here>> http://www.easylocks.co.uk/easylocks...rs-p-3966.html, but the correct track is 40 pound a length... talking 5x 2.4m lengths for an 8x4 machine...
so i think v bearings arent as dear as we think... unless patio rollers could be used with something else as track...