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Looking at the picture I think it highly unlikely there is another motor. Arms are generally linked to a mechanical cog systems. Of course any of these can loose teeth, fracture, especially if the are abs plastic. That will cause all sorts of problems for the arm movement.
As your question i am giving you a brief answer
Mid-shaft humerus fractures occur away from the shoulder and elbow joints. Midhumerous injuries/fracturs are commonly associated with injury to one of the large nerves in the arm, called the radial nerve.
Usually radial nerve cause this injury and make the wrist and elbow twist or pain.
Hope this answer will help you. if so, please kindly rate it.
regards
Astronomical telescopes usually show an upside down image. There is a good reason for this- erecting the image needs more bits of glass in the light path, which reduces the amount of light and increases aberrations. Even if this is only slight, astronomers prefer to avoid it, and they don't really care which way up the Moon or Jupiter appear. It is possible to fit an erecting prism or eyepiece to most astronomical telescopes, and some of them come with one, but one wouldn't bother to do this with the small finder scope.
You might like to visit an excellent website for first time telescope users at THIS LINK
The mechanism consists of the main turret, a short sleeve cover that moves with the wiper and the wiper support arm. The short sleeve cover is simply clipped on top and bottom, ease the cover apart to un-clip and lift upwards towards the wiper to free it from the wiper spring hinge. Exposed beneath you will now see a 5mm Allen bolt that retains the wiper arm on the 'telescopic' shaft. Remove this bolt, lift the wiper arm away from the glass on its spring hinge and then pull the wiper assembly off the telescopic shaft. Some real effort may be required here, but it will come free eventually. The turret cover is clipped on top and bottom and loosely around the telescopic shaft bearing.
Once exposed you can see if there is any fault by switching on the wiper motor and watching the motion. It is a beautifully elegant design and is very well engineered. I have never known for this mechanism to go wrong (but there is always a first time), it only requires the very clean and occasional grease up.
You said the the telescope throws out too far, is it that the wiper blade is hitting the edge of the screen at some point. I would suspect that either the blade fitted is too long or the the wiper blade pivot mount clip to the end of wiper support arm is either worn or is incorrectly fitted.
Refitting is the reverse of the above
possible grit you are feeling is from the water softener breaking down. the softener contains a brown resin. this ofted happens if you have connected supply to hot water. best connect to cold
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