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I would say that you are one of the fortunate ones with chains and sprockets in as-new condition. Presumably the rest of your engine is as fresh? I replaced both chains and all sprockets on recent rebuild I did, and had the similar result of tensioners being much more compressed than we normally see. Its a good thing.
Just eye-balling it, I think your collars are thicker than the ones I remember. On the old ones (usually anodized blue or gold), the aluminum collar was actually slightly less in thickness than the diameter of the the heads of the cap screws.
Personally, I would leave them out. Tensioners give lots of little light warning rattles as they are getting soft. If your ear is paying attention, you will know something is up before it becomes a catastrophic problem. The collars could lull you into a false sense of security (whats that noise-oh, probably nothing--and anyway I've got tensioner guards). Could catastrophic chain failures have been caused by the collars banging up and down on a soft tensioner, loosening or breaking, and falling down into the works?
DG
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