Thought I would share this...some may already know of them..I came across them a while ago...and as I have a 'bit' of work (well not really work) putting in/on some what's known as farkles or accessories to my steed, these may assist..
Sorry for the poor pic, was taken with my phone.....but if you search for Posi-tap or Posi-twist you will get a better view...
Anyhow, it is just for interests sake
Cheers
Kev
P.S.
I must get around to listing what bits i'm putting on :)