This may be a bit off-topic, as it concerns horizontal panning movement and not on GH1720, but since it is about Gitzo heads I'll add it anyway.
Some years back, I had the somewhat careless habit of keeping my Gitzo 2380 outside on our open balcony with my waterproof scope attached, ready to use in a second if something of interest would fly by, which frequently happened. There was some rain occasionally, and sometimes the gear would be wet. After a while, the panning action of the Gitzo started to feel decidedly notchy and stiff.
Rather than send it over for repair, I obtained an exploded view drawing of the head, and dismantled it myself. The cause of the problem was quickly found: all the ball bearings for the horizontal movement were rusted. I fixed the problem by cleaning everything carefully, discarding the ball bearings, applying new grease and purchasing stainless steel ball bearings from a specialist bearing dealer, and it has worked as well as or better than new since.
Non-stainless bearings in a non-sealed place in gear intended for heavy outdoor use is not what I'd like to see in what is sold and priced as a quality product, but that is what I found. Luckily, the silicone fluid parts of the head were not contaminated and the rust had not yet caused any lasting damage to the parts that would have been harder to replace.
Last edited by kabsetz : Thursday 14th September 2017 at 09:13.