Zerp 4 Before buying this adapter I read of three problems.First, one reviewer said the adapter broke quickly. Sometimes things break. But I have hit about 200 balls with this one so far and no problems.Second, the ferrule was too small. Usually the paint has to be sanded off in the area of the ferrule. I did that and it fit very well.Third, that the adapter couldn’t be tightened. I had no problems with this. But the supplied screw does look longer than the one currently in the club head. And the new one also has a couple of extra washers. I'm guessing the new screw is too long and the washers are meant to alleviate that problem. If I needed to use that screw I would use a grinder and shorten the screw a bit. Of course you need the tools and know-how to do that.Works fine for me. Ordering a second one soon so I can try another shaft.NOTE: I generally mount the ferrule with a small amount of glue prior to putting on the adapter. However, the ferrule apparently fits so closely that it wouldn’t subsequently fit into the adapter. I would therefore recommend putting some epoxy on the base of the ferrule and placing it onto the adapter first, then slide the ferrule/adapter on as a single unit.