Working on a 9.5hp johnson, model mq-12a. How do I remove the brass(?) bushing and o-ring for the shift rod on the lower unit? The Seloc manual says to use a special tapered punch for this job. Can I get this punch at a hardware store and how do I apply it? Also which o-ring do I use from the 18-2682 kit I got? There are two that are about the same diameter, but one is fatter than the other.<br /><br />Thanks in advance