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rephrase...
Sorry..
Let me rephrase:
The sprocket moves about a total of 3-4 inches.
Something like this:
[====X====]
.......^ H ^
..........H
..........H
..........H
..........H
Ok... that's a very crude drawing... sorry! LOL
__________________
---JIM---
I reject your reality and substitute my own...
(Mythbusters Fan  )
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