The missing part is the 'backgear layshaft' which has two gears, one large one small. However it is not essential to getting the lathe going to start with.

Do you understand how the belt drive is arranged? Your first picture in album shows it more assembled. It needs to be arranged so that the weight of the motor helps tension the belts.

And the two covers for gears.

David 

Edited By David George 1 on 13/01/2019 19:58:33

Ian, look at the first photo in the 'Zyto owners only' thread. If you can set it up a bit like that, but with the mounting point nearer the late and the main arm leaning backwards then it puts tension on the belt. In the Zyto version he has an arm to hold it upright and apply tension. In David's second picture above there is a horizontal knurled nut which is another method of pushing the intermediate shaft assembly back which you might need if the motor weight is not enough.