TONY SPEZIO on Grizzly/Jet 9 x 20 Lathe Modifications:

Reverse Tumbler Gear

I would like to have more space between the fwd and reverse gears. With the 80t, it will be in the original position and with a 45 the triangle bracket will travel further away from the spindle and it will over center better. With the 60 gear I run out of room on the backside to make the upper of the triangle wider. I hope this makes sense.
Right now the 60 X 60 works OK, but it wanted to jump out in reverse. I had to make a deeper detent for the spring loaded ball.