If you pull that thing out of the end of the timer, you will see that its the male part of a plug that goes into the recess in the timer lever, and fits onto two electrical terminals.
What you’re missing there is the Bakelite cap that covers the threads. You don’t need it to run, but you will need to connect two leads to the male section of that plug.
Hope it helps
best,
PM T2
He's livin' in his own private Idaho..... I hope to go out quietly in my sleep, like my grand-dad did..... and not screaming, like the passengers in his car...