Turns over freely and runs on air. The flywheel just touches the base casting in one position, it needs moving along the mainshaft by a small amount to centralise it in the well.
| length/inches | 14 |
| width/inches | 7 |
| height/inches | 8 |
| weight/kg | 9 |
| wheel material | cast iron |
| axlebox type | split bronze |
| cylinder material | gunmetal |
| valve type | slide |