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Lang tailwheel shimmy

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Cub822

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I have about 30 landings on a Lang tailwheel, started shimming last two landings. Tailwheel assy was not new prior to my acquisition, hours unknown.
I discovered a little movement in the rudder to steering horn, fixed that.
As far as tailwheel set-up: how much slack in the chains should there be?
How tight should be the nut on top?
Geometry looks ok, don’t think I bent leaf spring, but something just changed.
Thanks for any suggestions.

I’ve currently got about 1/2 link of slop
On each chain

B12C61A7-740B-4502-BA4A-1D4410AE8210.jpeg
 

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