Another little bit of trivia about the family of saws starting with the P40. The P40 started with 5/16 in. bar studs and no chain brake. Later in the production a chain brake was added with holes matching the 5/16 in. studs. Then the stud size was changed to 3/8 in. The P41, P50, P60 and everything that followed had the larger studs. The P50 and P60 started out with no chain brake and they were added later.
l am not aware of a Chain brake assy being availiable for the later P40 Saws. Their was though a Steel Handle Guard availiable as a accessory (474614) attaches to the front handle of the P40 after serial No. 1113801
They are hard to find.