A couple of points from my experience on ebay:
You now have no option for “cash on collection” if you sell through ebay – the payment can only go through them. That means you must be extremely careful about verifying buyers to ensure they are not scammers.
Add a note in the listing that than bids will only be accepted from people with eg. 50 or more feedback and active on ebay for over a year. (You can view their feedback by clicking the number next to the user name, or via the user name & see dates of transactions they have made). That should reduce the chance of timewaster who bid but cannot actually buy and collect it.
Collection-only items often go for far lower prices than items that can be shipped – especially large ones.
For something a valuable as this lathe, I suggest you contact some machine moving companies and try and get prices for packing and shipping it.
If you can add that as option in the listing as well as collection, it will greatly increase the number of possible buyers and improve the same price.
And if it does end up selling for collection, arrange a video camera (spare phone etc.) to cover the collection meeting to prove it was actually picked up, hopefully with the person face clearly visible, and make sure you have the vehicle registration etc.
(I did know about the code Pete mentioned above – but for a large collection like this you should hopefully be able to get that part way through loading things.)