I got in touch with the chap at Mike’s workshop and he sent me this link said it should work on mill or pillar drill so I am going to give it a go
http://mikesworkshop.weebly.com/rota...-the-mill.html
If that fails I am going to heat to cherry red and press a 11mm Allen key in as I am going to turn shaft down to 14mm before fitting.
Dell