The VHGMC horticultural ploughing rules state a minimum depth of 12cm. Just under 5". Not that I'll be taking part in any of their matches. My tractor and plough don't qualify.
I put the tractor up on the lift and with the plough hanging over the end, board lying along the lift and plough down, the above depth was ascertained. Now the actuator that does the up and down business, has no in between position. It's either up or down.
After much trial and error, the tool bar has been modified. The tongue that goes into the slot hitch has been raised so the tool bar is lower. It was also extended and now has two holes for the slot hitch pin. First hole is in the same place and the second an inch back. This has given me two positions. The first hole gives just over 12cm and the second just over 13cm.
That'll do for now and the test will be the Hethersgill Vintage Club ploughing match next month.