I've been to Basler several times I don't think they do conversions for this type although Ive been tempted by the C337 conversion!
Ive also a sneaking feeling that meleagertoo (Mel?) is already ahead of me but for decorums sake I have a clue:
The old prop blades are stored in these boxes formerly belonging to......
Russ
Edit: This Basler 337:
