Tutorial An easy introduction to making wood ornaments by Stephan Kertész (Steef66)

Make sure that the part with the 2 small guidance wheels is corectly installed. There is a difference on the top and bottom. Make sure that the part with the extra edge on the side of the spring not on the side of the elektro motor. It works in both was, but if it is in the wrong way, you can't u screw the chuck.
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You can leave the elektromotor out of it and then try to u screw again

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There are a lot of parts in the handpiece
Sometimes you need to clean it, get the dust out. Make sure to handle the ball bearing in the middle with care, the balls can get loose. Keep it together or make sure not to loose parts of it. The plastic cap to screw u screw the bur can only placed in one way. There are notches what go along the part with the tiny wheels. Fasten the elektromotor with the cable as last.
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Y.T. said:
Only by tightening spindle into a vise I was able to release the collet.

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problem solved. Now you understand why I said take an extra handset when you want a chuck for burs with another shaft.
I have even a spare lying around, because like the lion figure head I'm making now. The hand piece could get pretty hot after a hour work. I change the handpiece if I'm not want to wait and go on. Only the 2,35 mm. Chuck I have that, because I work most of the times with these burs.
 
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