Molas de válvula
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quem já manuseou sabe como é duro comprimir uma delas…nos vídeos parecem de gelatina
<center><object width="425" height="350"><param name="movie" value="http://www.youtube.com/v/i_npzu4pgjc&feature=related"><param name="wmode" value="transparent"><embed src="http://www.youtube.com/v/i_npzu4pgjc&feature=related" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"></object>
http://www.youtube.com/watch?v=i_npzu4pgjc&feature=related</center>
<center><object width="425" height="350"><param name="movie" value="http://www.youtube.com/v/_req1pum0ry&feature=related"><param name="wmode" value="transparent"><embed src="http://www.youtube.com/v/_req1pum0ry&feature=related" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"></object>
http://www.youtube.com/watch?v=_req1pum0ry&feature=related</center>