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1:4 Scale Jet Ranger Foot Pedals, See video on You tube of the functionality.
http://www.youtube.com/v/9Wj8mSCV8Ws and also http://www.youtube.com/v/UEOGtXg1wNw
This model requires fixing bolts to suit (2mm) and 1 x 3mm x12mm long bolt to assemble the Extend / Retract Piston - this has to be glued into the Adjustment Knob. Fully Functional & fantastic detail.