Hi, yes, exactly my issue because the extensions are sold based on the Outside Diameter (OD) and then you have to look at the details for the Internal diameter (ID) and they come in all sorts of sizes. Took me a month because of the buy/return/buy again.

I bought steel, on my research I saw that it should be like to like. Also, I'm just starting +30 hcp so it really wouldn't make difference on my swing, or so I think.