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1st thing to check is the flatness of the cut that was done on the ISP. Hopefully you got the cutting guide with your frame cause that makes this much more accurate to check. The cut needs to be perpendicular to the seatpost, not horizontal to the ground. Also, after cutting, I used 400grit sandpaper on a sanding block to make it perfectly flat with the cutting guide. It ended up lowering the seat clamp by ~2mm more than the initial cut, by the time I got it perfectly level, but then the seatclamp has even pressure on the spacers and shouldn't ever rattle loose.
 
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