I have a 25" shaft 1995 120HP Force Model# H120422RX SN#OEO96788 that I would like to install on a 20" transom. The lower unit looks like it has an "extension" as opposed to a one piece leg. I checked in a Clymers service manual and this "extension" is not shown. I am wondering if this extension and possibly unseen drive/shift/water tube extensions could be removed to shorten shaft length to 20" (I have seen similar extension kits at www.baymfg.com) Has anyone had any experience with this?