Not long ago on Azamom.com
(sorry, now sold out) I came across a pretty good deal on Common Sense RC CSRC-311 standard-sized servos.
Naturally, I wanted to modify a few of these for continual rotation. The method I came up with is super easy and requires no soldering!
Interestingly, you don't even break the "warranty void if removed" sticker. (What the...? We're not even voiding the warranty!?? Well what fun is that???)