Aiden gave it his all & I watched with great delight as this gutsy little car was urged ever onward to new thresholds, but when the tail started to move around when it shouldn't, Aiden very wisely brought it in.
Oil was leaking from the brass fitting in the oil pump that allows both the original idiot light & an oil pressure guage to be used, & it was reaching a tyre, which caused the unwanted tail movements. When he applied a little pressure to tighten it, this is what happened.

To learn from your misfortunes is wise, but to learn from the misfortunes of others is VERY wise. It would seem that the heavy mass of the brass fitting caused a fatigue fracture to originate from the base of one part of the cut thread [as in, not a rolled thread] It started to leak & the car was brought in before disaster struck.
If the fitting can be remotely mounted, with a light & flrxible hose from the pump to the fitting, then this problem can be avoided.
Fortunately 'The Boss' had a complete spare pump with him & this was fitted in time to have another run or two.
We can all learn something from this.