Thumb F(sharp) Roller
A single roller on the right thumb F(sharp) key adjacent to the low E key. This can be done alone, with a roller on the low E key, or with a crown on the low E key.
Catalog Number: 75
Available On: 601, 660, 201, II, III, & IV
Standard Included On: 240, & 220
Conflicts With: Thumb F(sharp) with two rollers (76)