Here we go, it's been a few year since iv stripped a slosh down but if I remember right there never had an instant anti reverse on the driveshaft as the Penn mags and new modern reels do now, if you take the side plate off on the gear side you should see underneath the main drive gear a metallic pin that jams up against another cog beneath the drive gear, this may of slipped out of position and is not connecting with the cog when the handle is reversed, it's quite a simple fix and if I find my slosh I will take it apart and take some pics if you are stuck. I hope this helps