The pattern lists yardage requirement for two finished sizes
Singer 6106 Instruction Manual (Model 6106) - 44 Pages
S-3015 Schoolmate
000 LUX at 12in
If the belt does not taper place it around the geared pulleys
Non-Stick Foot for Needle Feed, Singer #MT20 POD Manual The pattern lists yardage requirementNon Stick Feet are great for working with leather, laminated foam, rubber, and plastic fabrics. This foot is designed to eliminate drag and pucker while not damaging fabric. Guaranteed to fit Juki Sewing Machine Models: DDL 8100E Guaranteed to fit Singer Sewing Machine Models: 1300, 191D, 195K, 196K, 241, 245, 251, 281, 31, 331K, 366K, 400W, 44, 451K, 491, 600W, 660A, 771, 95, 96, Centurion 121D Alternate Part Numbers: 24983MT