By John Kettlewell We all have a tendency to blame the hammer when we hit our thumb with it. It's the same with anchors. You sail into a beautiful but crowded harbor, drop the hook while looking forward to celebrating with an evening cocktail, only to find the darn thing isn't holding and instead of that Marguerita you have to pull on a mucky chain. Sometimes this process is repeated several times until something goes right and you have a solid bite, or you give up and look for a mooring. Since I've been anchoring cruising boats for close to…