Traxxas Servo Digital High-Speed Metal Gear (Ball Bearing) Waterproof Slash 4X4 Optima Parts Genuine Traxxas part 7773

Genuine Traxxas part 7773

(1) 62 mm Double Track Concrete Tie Straight Feeder Track

and the goal is to reduce the sliding friction between the piston and the case wall

or carry on supporting the line once it reaches full viaduct height

This is the Altimeter from Estes

Traxxas Servo Digital High-Speed Metal Gear (Ball Bearing) Waterproof Slash 4X4 Optima Parts Genuine Traxxas part 7773Traxxas Servo Digital High Speed Metal Gear (Ball Bearing) Waterproof Slash 4X4 Fits: Slash 4X4 Ultimate Unlimited Desert Racer E Revo VXL Brushless Rustler 4X4 VXL TRX 4 Assembly Kit TRX 4 Ford Bronco TRX 4 Scale and Trail Crawler TRX 4 Sport TRX 4 Tactical Unit