There are lots of ways to perform a circumcision.
A couple of sites that list various methods of performing the procedure:
This one is actually an anti-circumcision site, but lists quite a number of ways to perform the operation: Methods of circumcision
Yes, some of the contractions do look like medieval instruments of torture.
Of course some pro circumcision sites list techniques and instruments too: Circumcision Instruments & Techniques
Here is yet another resource, a more medical description of the various techniques:
Techniques of Male Circumcision
