I have a 1971, 21' MacGregor sailboat with a swing keel. I am not pinning?bolting my keel in the down position because I cannot find the thru-bolt hole in the keel. Will someone please answer the following questions:Does the 22 (and others) Ventures and/or MacGregors have a thru-bolt hole?Do you use it everytime you go out?Do you pin the keel when you are in rough weather or offshore?Have you drilled thru the keel where the holes are in the keel slot?I will be going offshore this spring to Catalina, Santa Barbara Island and the Santa Cruze Islands. And am a little skeptical about not pinning the keel at that time.Please let me know what you have and what you do with it.Novelman