I had several steel plates that were worn so I just ordered new ones and my cdrom says if the whole pack of friction discs has to measure at least 27.5 mm, mine measures 29mm but do I need to check and make sure they are not warped like the steel plates and if so how do I check them? thanks

 

Not sure how you could check the fibers warpage other than to measure the stack height like you did. You seemed to be well within the limits though. 3.75mm warpage + 27.5mm = 31mm max stack height and your at 29mm

 

ok thanks ealgecollector, maybe i should check them on a peice of glass like the steel ones