I don't use a tork wrench but really put pressure on with a prop wrench (the ones that are also used for the glow plug). On some engines that have a tendency to spit the prop off the crescent wrench comes out. For most engines of the glow variety this is sufficient. Checking after a few flights and re tightening will normally hold quite well with an APC prop. Wood has a tendency to compress and needs to be checked more often.

EXCAP232