This is an area I had been aware of .... The shimmy problems I have seen are usually due to the sissors bolts being too loose....
The sissors are mounted to the fork and strut, with a set of bolts mounted thru phenolic bushings ( replaceable). The proper installation, is that the bushings should be slightly longer than the mounting hole, with a new bolt, and serrated washers. The bolt is positioned thru a washer, then thru the sissors; then a serrated washer, the bushing, 2nd serrated washer, sissors, washer, and nut. The proper touque is to tighten so that the sissors are tight against the bushings. the bolt should not turn in the bushing --- the bushing should be clamped to the serrated washers & sissors, and turn in the casting. There should not be any play in the sissors... Now, mechanics unfamiliar with the assy, are likely to tighten the bolt, then loosen it until free to move ( now it will shimmy); not understanding that the bushing is supposed to turn in the mounting hole - not the bolt turning in the bushing.... Hope that made sense. I think it is correct. Fly safe - Have Fun ( without shimmy) Harry
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