A member on my page just messaged me this info for you.
The square port barrel is model 2 rotomo
The cross drilled round port barrel is the 3.6 hp from 2a on
It has nothing to do with noble
Or tiger
So the round port barrel doesnt belong to either of his rotomos
Model 1 square port
Model 2 square port fin design change
Model 2a and 3 crossed drilled round port
2hp
2.5hp
3.6hp
Stud length is different on the round port as they no longer needed the dome nut on top as it was covered
All port covers face the same way
Opposite to what they look like they are meant to go...
Hope that helps
