Installation of my pneumatic retracts was straight forward. I only had to widen the spacing between the stock mounting rails just a little bit for each retract housing to slide into and grind a notch in one of the ribs for each air cylinder. I also enlarged the wheel well openings to 4" to accept 3-3/4" diameter main wheels.



I'm using a set of custom made Century Jet with 1/2" diameter oleo struts, but Spring Air would work just as well.

here is a short video showing the retracts in action: [link]http://www.whitetyphoon.com/rc/gsp_retracts01.mov[/link] (1.9MB)