Hi thanks for the replies - I was not aware of the club nearby, handy for me as not heard of them before, I will check the chuck insert against the register plate, I have inserted a small packer there as noted above, it's helped a quite a bit but am going to investigate this area more and may adjust to suit
Whilst the chuck was second hand to me it appears to have had little use if any and as the above has made a difference I don't think there's a problem with the chuck