Hi Stuart

Many thanks for getting in touch. Wish I could come back with more positive news on this one, but unfortunately we only sell these as complete units. I’ve searched the internet for you too, to see if I could find you a suitable alternative but unfortunately I can’t seem to find anywhere that does sell these as separate barrels alone, especially the 7/8″ size that it seems that you’re after. 

We do have one alternative, which is our stock code G1800. This is at a lower price than the G1700, but it does not have the 7/8″ jointer that you’re looking for. It only has the 1/2″ and 5/8″ sizes. Sorry I couldn’t be of more assistance!