Thu 23-Feb-12 04:42 AM | edited Thu 23-Feb-12 04:44 AM by jrp
Chris, Thanks for the reminder. I should have added that I eliminated the center column with a Markins TB-30 plate first and lately the whole hub with a TH-300 hub replacement, so I never had a low level problem waiting to be solved and no need for the Power Disc.
I ended up buying the GT3530 as it was essentially unused. I'm sure it has the original center column and power disk, and I really don't see any problem with it as-is. Why are folks swapping these parts out?
I don't know if anybody is swapping them out. As far as I know, the only difference in the disc on the center column is that the "safe-lock" material and locking screws have been added which, according to Gitzo, makes a more secure connection between the disk and tripod head and helps to eliminate vibration.
I can't recall anybody griping about their tripod heads coming loose on their Gitzo and I'm dubious about any significant difference in vibration damping.
Most concerns with Gitzo were with base plates working their way out of the systematic tripods and that was not addressed in the 3531 upgrade. Gitzo has addressed that concern with their latest models (3532).
Opinions vary on whether the base plates working loose was a valid concern. It is certainly a manageable concern though.
You have a fine tripod. IMO, you haven't given up anything important by going for the 3530 instead of the 3531