The very first 450 cc driver I made for myself was an Integra beta titanium head with an SK Fiber PE shaft I
built at the advice of Bernie Baymiller. I used that driver for several years (even after having to change out
the shaft from Regular to Senior, as I got older). Finally had to abandon it a few years ago when it developed
a rattle that I just couldn't stop. The head's still sitting on my workbench, but put the PE shaft into another head for a buddy!