For the last 3 years I have used the Axminster heavy duty drive unit with a reciprocating carving head. However, recently the +front cover (right behind the chuck) has come loose and I can't screw it back in, as the inner sleeve with the other part of the thread has retreated into the outer casing. Details are visible in the attached photos.
I've contacted Axminster, but they don't have drawings and their advice was to buy a new carving head (£54). I was wondering whether anybody has experienced a similar problem and could give advice on how to get the inner sleeve back towards the front?