If an object and its image under the transformation shear(or stretch) are given, how can we find the invariant line.

I have a John Deere snowblower that only 1 side of the outer auger is spinning when engaged/running. The other side does not move & freely spins when the motor is off. I am assuming this to be a shear pin. Or does anyone else have any ideas?

On my Craftsman snowblower, I need to put in a new shear pin. (model #536-886120)There are two holes on the outside of the shaft that goes through the left tire. Into which hole do I put the shear pin - the one closest to the tire or on the outside? THANKS

I broke a shear pin on my craftsman snow thrower. The head and retainer nut are sheared off properly but I don't know how to get the actual pin out of the shaft. Should I just use a small screwdriver and hammer and just knock it out? I have replacement pins.

my engineer wants me to nail my shear at 2" oc. Doesn't that tear up the 2x4 and plywood??