took a while to find it but this thread has a lot of info. Rs from about p105ish onwardI originally just cut it at around the bottom of the deck
Official Squape R[eloaded] thread!
also check out this pic of a decent build..
Photo by Chris Trueman
the secret is making sure it only heads down the channels a bit and doesnt stick out so it gets dislodged when you screw it back into the tank.