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Old 20-03-2005, 02:51 AM
ausastronomer (John Bambury)
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Join Date: Mar 2005
Location: Shoalhaven Heads, NSW
Posts: 2,620
[QUOTE]Originally posted by janoskiss
The spider is the only bit of the scope that exhibits significant sustained vibrations. But I only found that out by plucking the vanes. I suppose in strongish winds that might be a problem.

Steve,

You can fix that problem. What you do is put 2 stainless steel 1/4" washers under each of the 4 thumb screws that tighten the spider vanes. When you tighten the thumbscrews the washers help to take up a little freeplay in the spider and allow you to load it up tighter agianst the tube stiffening the spider vanes in the process. Another advantage of doing this is that it subsequently allows you to have a little more lateral movement respect to centering the spider in the tube.

Clear Skies
John Bambury
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