Yes !
Hi There,Yes it is best to have a keel lock down bolt. You can purchase it from Catalina Direct they are on the net and the bolt is relatively inexpensive. If it's $8.00it's worth it, because without it you will find your Catalina a very moody disposition. Meaning that the keel will swing free and when heeled over to any extreme you might find it slamming back into the keel trunk with enough force as to damage it and the trunk. Causing a leak.Also as you pick up speed without the lock down bolt the keel will rise back toward the recess in the hull and if you should get a good gust of wind which I know can happen in that part of Lake Michigan you might find yourself with the rail buried in the water as you are losing stability, without it fully extended below your boat.Hope this answers your quetion.Dave LaPere