Torquing Action Screws

Some rifles come with an specific allan wrench for torquing the action screws, these allen wrenchs are a spicific length and have a weight that hangs from the allen wrench and applies the correct torque. Has anyone seen these or know how to make them for a Stevens 200?

If not does anyone have a recommendation for a torque wrench for this purpose that wont break the bank or have the wife disown me this close to Xmas.