The photo above shows my "home brewed" modification to the reverse pedal on my 425. It was made using a 1/4 bolt, 2 nuts, two washers, and a rubber electric motor mount salvaged from a previous project.
I drilled a clearance hole in the top of the existing reverse pedal,and the same size hole in the side of the motor mount, inserted the slotted head bolt from the underside of the pedal and attached the rubber mount using a nut I had force fit in the through hole. You can see the nut in the photo. This mod took
about 30 minutes and it resulted in about an inch more pedal travel causing reverse speed to increase to about the same as forward speed.