2018 Sea Doo GTR 230 - I bought a Sea Doo Boarding ladder (Part number 295100742) to instal on the ski but looking for any advice before I drill into the hull. The alignment looks straight forward enough, but I wanted to determine if the holes actually go all the way through the hull. I have pulled up the instructions from the installation.brp.com website (we have drain hole style B) which says to not drill deeper than indicated, however I do not see where it says a specific depth to drill. I have had two people look at the instructions who have not been able to find the drill depth so figured I would ask here. Outside of the drill depth, I believe if I am reading correctly I will use the course thread screws not the bolt style ones? Also do the screws seal tight enough or would it be good to use a sealant for waterproofing redundancy? As always thanks in advance.