Hi there, sounds like you have a SUP mast where the screws are glued, to give it the maximum stiffness. Unfortunately only the Flow Windsurfing mast has the option to undo the screws to attach the tuttle adaptor. there are some after market adaptor plates from other brands where you can use the 4 screw solution to screw onto a plate with a tuttle box which is attach to that plate. Here is one of the high end versions, there are also cheaper options if you surf the net a little. Sorry if you were wrongly advised on the mast.
https://www.mackiteboarding.com/chinook-powerplate-foil-box-adapter/
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