I have an 03' 200 H.O. I want to get speedometer working again, Hose is fine, it has a little wood way down inside the hole on lower unit. I did the drill bit thing about 2" deep, its still clogged up what else can I do to help break up the wood that is way down inside. Blowed air into it where the hose comes into motor. Can I put a little acid in a syringe and squirt in there to break loose wood. any ideas.