[IndySam]

Originally Posted by Peter Matteson

Traditionally we have not been allowed to use them but I have to say I don't see any rule against it this year.

Normally the GDC's round about way to get prevent use of spring return pistons is that you can only use cylinders equivalent to the free order form parts from Bimba which did not include spring return, bore size and stroke. This year <R73 D> only has a maximum bore and stroke.

I'm actually surprised they opened it up this way finally.

Edit: I guarentee that it is asked at least 6 times in the official Q&A anyway because this question is asked every year.

They opened it up last year. Teams did use spring return cylinders. Please don't call them pistons.

The problem with spring return cylinders is you are stuck at the return rate the manufacturer gives you (unless you find someone who will make custom ones.). It's not hard to use a little surgical tubing and make your own spring return where you decide how much spring to use.