Posted 09 August 2011 - 11:08 AM
There are a lot more guys on this site with a lot more expertise that me, but I can tell you how I went about finding a replacement shaft.
First, what are the characteristics of your current shaft (aside from being in 2 parts)? launch, spin, feel, bend profile
What do you like, dislike about current shaft? Do you want to launch the ball higher/lower? Does your current shaft feel too boardy/flimsy?
How much do you want to spend?
Look at all the websites of the major manufacturers to see what fits the characteristics you're looking for. For instance, a shaft in the mid launch category would be a Grafalloy PL Platinum, GD Aura Gold, Matrix Ozik Code6, etc... I believe Miyazaki has a chart with bendpoint profiles of many shafts, which will give an idea if a shaft will be tip stiff, tip soft, butt stiff, etc..., so if you like the feel of a certain shaft, but it's too pricey, look for a similar profile in a less expensive model.
If you have a fitter nearby, take your list to him, and, hopefully, he'll have a few of those shafts available to hit and/or recommendations for other options based on what he sees.