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Home✈️Aircraft🚁Helicoptere-MikadoLogo 690 › 690sx tail pulley tensioner
01-11-2015 06:22 AM  5 years ago
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ToddM

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USA

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690sx tail pulley tensioner
So as part of the tail box on the the 690sx is the tail belt tensioner. Mine has 2 bearings, 2 washers that go in between those bearings and then 2 small black carbon tubes (sleeves) that go on either side of each bearing.

Do all of your kits also come with the carbon sleeves? Do any of you have tubes that are metal? I noticed in the original pic of the 690sx, the tubes were aluminum.





Logo 690SX SAB 570
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01-11-2015 03:02 PM  5 years ago
KevinB

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Earth

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Mine came with the plastic spacers but I made some metal equivalents to replace them. I found if you tightened the bolt anything more than barely snug, the plastic spacers would compress and deform. I also replaced the plastic spacers at the front boom support strut attach points. Same reason. I used two aluminum TR blade shims on each side instead. Worked great.

KevinB
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01-12-2015 04:22 AM  5 years ago
HilliHeli

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S.MI./FL.

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There is some more info on the brass-sleeves that can be used in this thread ;

https://rc.runryder.com/t779580p1/
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