Lantern10 and Westaussielame, thanks for the responses. It looks like you are both right. The T-bar would seem to be a locally made holder for the Champion two-pronged feeler gauge. Interestingly nobody on this half of the planet has seen this stuff before.
I will purchase some replacement feeler gauges and see how to source or create more T-bars.
Edit: just realised the T-bar is there too!
Last edited by Kemble Pitts; 21st Jun 2020 at 19:29.