i just changed tips from a hard to a soft layered tip, but now there is a rattle or buzz when i hit a ball. i have 2 shafts, 1 medium tip, 1 soft tip, when i lightly rap/tap the medium tip shaft (not with the butt installed) it sounds solid, but when i do the same with the soft it sounds totally different, also i heard this same vibration type noise while sanding tip after installation. what is going on this shaft was fine before i retipped