Hi Javier, Thanks for the kind words,,, Unlike the K&B the TT will handle the P-215,, it's
better if it has 1mm (.040")or more removed from the outside edge.
Conversely, the 440 don't work as well on the TT as it does on the K&B.
The 640 is the "go-to" prop for the TT and it is similar to the 215,, reducing they're OD
at different diamiters would be all the props you would need for the TT O/B at all stages of mod.
Once you do a couple you will see it's not that hard,, a good equal "scribed" mark just inside
the outer curved part of the blade is the key.
The rest is just sharpening the back side (faces forward) to the "new edge"
and balance is all there is to it,,, this is something you will have to learn eventually or
you'll have to wait for someone to do it for you,, sometimes weeks,, maybe months