Trevor, unfortunately the 3 pins will not move without the key to turn the end of the barrel that rotates the 3 pins in and out. However if he does remove the mount he maybe able to get a pair of long pliers up inside and grab the end that had the special “ snap off head” bolt, ( if he’s really lucky!)personally I don’t think he will be successful working up inside the spare tyre mount and the wire wheel, up behind the cap. I feel that he’s either going to have to find another locksmith who maybe able to work it out, or drill the centre out as a last resort. The locking barrels do come up for sale from time to time. ( & I have a pretty nice 34 cap with key available if he needs one in the future) Dan