I have for sale a modified , used, set of Century jet retracts for the Giant Scale Top Flite FW 190. they are much stronger than the Robart and look better. Since I couldn't get a replacement small piston I had to buy my own and I replaced the originals with a much better one. I will tell you they are a bit harder to program since they have four pistons instead of two. the two extra are for the supports when the wheels come down because of that 77 degree angle. I am including the control valve and I marked it R for the retract side and D for what I used as the down side. the side opposite is for the second set of pistons and must match the D so they will collapse and extend the same way as the retracts. I have them set for how I used them but you may want to speed them up. the valve is adjustable. CJ suggested to keep the small pistons at full speed and just adjust the speed on the large ones. I had better luck with them without the gear doors . I will pay for shipping in the Lower 48.