had a ferrule replaced with an ivory ferrule. question: the shaft grew 1/4" after the replacement. any ideas as to why and how? i have another shaft bought with a ivory ferrule. both are schon shafts. both are 13mm. same tips. same weight. the replaced ferrule shaft isn't as stiff. feels spongy. might this have to do with the shaft increasing 1/4" for this repair? or something else?