Electric reverse switch for bench lathe

[Biddlecombe]

I recently bought a Grayson bench lathe that had laid unused in its original 1946 box for many years and have installed it in my workshop. I want to install a reversing switch in the electric feed and after research came up with the following which stated clearly that it was for use as a reverse switch for single phase 240 v lathe use. However it did not come with wiring instructions and I am no sparky, so I presume that I put green, brown and blue into 3 of the terminals and similar 3 wires coming out 3 other terminals but can anyone please tell me which ones. I cannot find anything online. TIA.
Peter