The topic has come up before. Just for everyone’s info. I just reshafted G410’s with Alta CB shafts from the G425, so basically the same shafts. There is definitely a lot of play in the hosel, in fact .370 shafts would fit with still a “lot” of play. I used the specific Golfworks ferrules for the G410 and they were extremely difficult to push on. I had to use my shaft puller, in reverse, to do so. The golf works ferrule installer wouldn’t fit over the collar.
Yes, a .370 is no problem, with the .355 Alta shafts I used lots of shafting beads, and with the correct ferrule they centred quite well. Curious that ping make these with that much play, oh well.