The S3 uses similar blades like the s1 right? Theoretically could we just pop off the case, pencil mod it and do the same thing as we did to the s1 and change freq?
Yes they look very similar, the man difference is that you have to take the S3 pretty much completely apart.
You have to get access to the back side of the blades since the resistors ar on the back not in the front like on the S1. So just popping of the case won't be enough.