1973 225 valve adjustment help!please!

turn each adjuster a 1/4 turn each way and return it to where you started before you fire the engine up. The things can get stuck to the point where you could accidentally break it off.

ErrrrrÂ…fer serious? I have never, ever seen or heard of this actually happening. That doesn't mean it's impossible, of course, it just means I haven't seen or heard of it actually happening. Have you? Much more common is for the adjustors to be too loose to hold an adjustment. Methods of dealing with that are covered in the link.