the Bearmach ones I got are solid not hollow. they are drilled and thread tapped each end. The theory I believe is that because they do not flex like the originals there is no harmonic vibration and no need for a damper. Having said that, a damper was originally designed to help with kick back when hitting potholes, etc. I tried it for a few days around Sydney, bad roads, and then put the damper on. I must say I didn't notice any difference. I did notice a big improvement going from the original standard hollow tube with damper to the new ones without. I figured that a damper is better to have than to not have. My damper is a Tough Dog RTC with the additional coil spring around it. Very relaxed over long stretches of heavy corrugations i must say.



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