I know this topic has had various solutions posted in the past. My method for turning between centres, which I haven't seen covered to date, is:- Use an appropriate socket from a standard socket spanner set. They need to be the type that has 12 splines (designed to accommodate hex and square nuts/bolts). These usually cover sizes up to about an inch or so square. This will of course require a centre bit hole drilling in the tail stock end. Hope this tip helps.