I custom ordered a 15 degree 913F with an Aldila RIP Phenom shaft through my club. I found the Phenom to be a little lower launching than I desired so I ordered a replacement shaft through Titleist (thru my club) Graphite Design YS 6+. I sold the Phenom on eBay to partially recover the cost of the YS6 replacement shaft. My buyer claimed the adapter would not fit in his 913 head. I questioned him on whether he had a 913F head or a 910 since the adapters are supposedly different. He said he has a 913 head. If that is the case, I am suspecting that the club head he has might be counterfeit.
Have you ever heard of any other reasons why a stock Titleist shaft would not fit in a Titleist head?
Thanks, Mike Marcis