There was a discussion here a few months ago on the importance of making certain the bolt that holds the crankshaft pulley was tight. I know I tightened it to spec when I rebuilt the engine, but I can't remember if I used Loctite or not. Just to be safe, I want to double check it as part of my Spring check-up. What is the best way to be sure the engine doesn't turn while I am doing this? I certainly don't want to do any damage in the process.