I don't go to Cambridge but do go to bisley. Interns or bolt handles. Not much difference between this and sterk. Sterk might have a thinner stalk bit. I will be machining my own one soon as well. When I have the time. But between raising offsprings and work it's difficult. As a sidenote. Anarchy outdoors won't send to the UK. You will need to find someone willing to post to you. Luckily I got a friend to but for me and send out to me. Still cost an arm and a leg. This one seems better in quality and more stout than the sterk.