When I've done it on a cello I've used a piece of aluminium channel folded over at either side so you can run a piece of string down each side. Then put the post in the loop. Fiddly, but it works.
I bought Darren's G+L JB2. Thoroughly nice guy, no problems at his end, packaging etc excellent. Cracking bass, as well!
I'd be very happy to deal with him again. Thanks Darren
This is a strange one - at least to me. It looks as if it's probably decent quality, and seems to have had an eight-bolt neck-to-body fixing?
https://www.ebay.co.uk/itm/334991575009?hash=item4dff0dc7e1:g:DDEAAOSwfcFksHHW