A bit of an up date. After I got the deck all built up, I noticed as it sat on the table, the right hand scalp roller was clear of the table, by 1-1/2 inch. I hadn't noticed when I stripped the deck, but the right hand side is slightly bent up. Discharge side. So it's all stripped down again and waiting to be taken to the farm round the corner.
Lad there is a qualified motor mechanic and has a nice big fully equipped workshop. So we're going to see if we can straighten it with one of his presses.