Quote Originally Posted by FatFreddie View Post
How about putting the bearings either side of the centre rail support? That way you increase stiffness but still get reasonable travel.
I think that would increase the length of the rails too much. Either way I've just found this on eBay, don't know how I missed it before:
http://cgi.ebay.co.uk/ws/eBayISAPI.d...id=p2759.l1259

I've emailed the seller to list 600mm - that should be cheap enough :)