Gabel, I am just finishing lunch and will take a peek at it. First suspicion is to space the two side apart with a shim/washer at the top where the round section holds it together. But I have to look to see it this is correct. Swap heads and see if it is the head or the frame.
As long as the head stays on the frame I would not be concerned with it, unless it really fouls up the mortice. If holes wonder you can control the size of the mortice when you clean up the triangles. Just like if the timber was out of square and the mortice was square to the whole, you will see bore lands on one side of the mortice.
The wobble may just allow you to locate the feed screw to the layout line easier, I see you are doing that. I do to sometimes, other times I wing it.
Tim
