I'am going to go with Sergio,for a minute here first.Yes I would say to some degree you are correct.Any bow built before the mid 1980's should never be used with FF string.The bow was not designed for FF in the begaining,because there were no FFS then.It was kevlar.And was worse on older bows then FF.Because the kevlar would cut into the tip overlays.It's so fine of strands it would find a way in.Olypic shooters use kevlar and only shoot 300 arrows per string and then it is dicarded as the strands start to break down.FF and kevlar are faster,no dout about that.But there is massive shock to the string apone release of the arrow.Those strings do not stretch,no give to the FF and kev's like a B-50 lets say.For every action,there's a reaction,and the reaction could be your bow breaking...Now the truth,I've seen 4 or 5 new T/D's and have seen oh about 40 or so grainsville bows with cracks.I've been lucky and repaired some,and some are like Joel's,they will never see the flight of an arrow again.Or let me say safly see the fight of an arrow again...What caused the cracks in about 90% of the ones I've seen was not the limbs or FF strings though.But was caused by water or moisture gettting under the sockets and spliting the wood.Any moisture will cause wood to split at some point.The last operation done on Bear T/D risers was the sockets were glued into the riser.The risers were all finished then they glued the sockets in.This was to prevent getting clear finish on the sockets.If there was an air-bubble in the epoxy,that would allow water into the cavity...Hence we got done hunting cleaned and polished our bows up and put her away for next week huh??? Never thought about that one stinking drop of water under the sockets..But it may have been leathal on some T/D's....now that I drug that one out to the limit...If you do use your Bear T/D,and it's wet outside.You can blow under the socket dry with low heat from the hair drier.Please I am not defending Bear Archery in anyway.They should make good on Joel's and everyone else new risers no matter what......That is a defect in matirals...This is the bottom line for me anyhow.You don't stand behind your product.Please don't stand in front of it....bowdoc