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Scale
This refers to the size of the miniature vehicle (model) in relationship to it's real, full size compliment. Since the normal size of say, a 4-wheel monster truck is far bigger than say a Honda Civic, their scaled counterparts will have this equal relationship. In other words, a 1/10th scale monster truck will still be bigger than a 1/10th scale Honda Civic.
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Servo
A self contained gearbox, motor and arm assembly. A precise radio control transmitter controls the exact position of the control arm at all times. This arm is then attached to either a steering assembly or a throttle control rod where it can mechanically steer or control throttle and brake response.
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Servo Reversing
A switch (usually on the radio transmitter) which reverses all controls to the servo. This is helpful when a servo is mounted in a way that would prevent it from operating in the correct direction, ie. when you turn the transmitter wheel left, the wheels would steer right.
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Servo Saver
A spring loaded mechanism that absorbs the shocks that the steering assembly sends back when the vehicle strikes a rough surface. This shock absorbing feature is needed to protect the servo (which is directly linked to this feedback) and it's delicate gears; especially when the servo contains plastic gears.
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Servo Tape
A double-sided sticky tape (typically foam) that is used to secure servos, radios, etc to the vehicle.
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Set Screw
See Grub Screw
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Shock Body
Typically, the cylinder that houses the silicone fluid and damper assembly and acts as a guide to the springs that cover them.
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Shock Oil
An oil used to dampen the movement of a shock's plunger that moves through it. Comes in many different viscosities (known as weights) that regulate the pressure per square inch per unit time that any object (namely the ported plunger) can move through it. This in turn, regulates the resistance to movement factor that is important when tuning a suspension system.
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Shock Piston
A small plastic disk that has a hole through the center to accept the shock shaft and smaller hole(s) near the perimeter allow the shock oil to pass through. The disk slided through the silicone oil-filled shock body with resistance created by the small aperature that defines the oil flow. Smaller or fewer holes in this disk increase resistance, therefore the shock's ability to resist movement or "shock". Many kits will come with a variety of these disks with various number and size of holes for the user to select.
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Shock Shaft
The internal rod in a shock assembly. Typically is threaded on one end to accept the shock ball cup and grooved on the other end to secure the shock piston.
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