Chainsaw Repair

Speaking of optical illusions here's a pic I took with my phone off my laptop.
This is a Stihl 36RM chain from the 1980's from a fellow from Germany.  Hand filing sure wasn't his best skill. Look at the rear sloped side plate angle with no hook what so ever . No wonder why the side links are wore out from all the down pressure to make that chain cut.

The RS chain also had the same ramped side link directly in front of the depth gauge. A design that was discontinued in the 1990's.
In 1989 I asked Hans Peter Stihl about the RS/RM "anti kickback side link" comparing it to Oregon's LG ramped depth gauge.
He replied "the hump back side link is just a optical illusion."
Years later the RS/RM chain design as we know today was introduced, and the humpback was a thing of the past.