| Ashford standard | Ashford double-drive | Majacraft Little Gem 2 | |||||
| Bobbin Hole Diameter | .25 | .25 | .625 | ||||
| Length #1 | 4 | 4 | 4.875 | ||||
| Length #2 | - | 4.25 | - | ||||
| Big End Diameter | 2.94 | 2.5 | 4.625" | ||||
| Big End Inner Whorl Diameter | - | 1.69 | - | ||||
| Small End Diameter | 2.375 | 2.25 | - | ||||
| Center Post Circumference | - | - | 2.5" | ||||