Just replaced a friends Mizuno JPX900 hot metal iron shafts with recoil .355 taper tip graphite shafts a few weeks ago. Used Golf Works Tour epoxy. Since then 3 shafts came off. What concerns me is the hosel depth seems barely 1″. We tried to clean inside the hosel but there doesn’t seem to be anything preventing the shaft from hitting the bottom of the hosel. Does this hosel depth seem correct or is there something else we should be looking at?