Fabricate F10-20 Spacer Block. Assemble: F10-18 L&R Pivot Angle F10-20 Spacer block F10-19 Attach Angle Ream F10-18 L&R Pivot Angle for F10-23 x 2 5/16" x 3/8" x 1/2" Bronze Bushings. Disassemble, press in bushings, reassemble all with F10-21 Idler, F10-20 Spacer Block and bushings for test fit. Need to polish off top of bronze bushings for free movement of F10-21 Idler.