Pay close attention to the balsa for the fuse sides. (grain, hardness)
If they don't match pretty close you pay for it all the way thru building it.
I'm dealing with that on a kit right now.
My impatience to keep building instead of waiting to get a different piece of balsa for 1 side has got me fighting this thing like crazy.
1 side is soft the other is hard.
Put those two together and you have the dreaded CROOKED FUSE!