The Prestigious and Powerful Porcine Prelate
Posts: 954
Joined: Wed Jul 14, 2010 4:59 am
Location: West Mids, UK
Field Rekeyable 12 Pin Tubulars
http://i71.servimg.com/u/f71/13/61/42/31/img_1011.jpg
You get a change key and as many operating keys as you like (up to 12). I only have 2, that shows the principle adequately.
I think they're about $25/£15 ish from memory? Not a lot anyway but more keys = more cost of course.