Hi, Last year I installed an after market Tensei Blue AV Series (SFW) on my G425. Because I cut it 1 inch shorter than standard, I installed a tip weight to bring the swing weight to D4. Saturday I heard something rattling inside the shaft. Initially I suspected the tip weight broke off but after removing the grip, a small black metal pin approximately 1/2 long fell out. Any idea what this pin is? Thanks.