you should have got the relevant instructions when you purchased the pole plus 3 bushes,spool of cotton, nylon pulla and 3 carbon strips the instructions tell you where to drill what size drills to use etc,also it shows instructional pictures to ensure you fit the bush in the correct position, i’d nip back to where you bought the pole and ask for a set of instructions on how to carry out the procedure,it’s too involved to jot it all down and you need to follow the instructions to a t as shimano also state that they accept no liability for any damage to your pole due to non compliance with the mentioned instructions,as i said nip back and ask for the leaflet.