Note the blender pot has a special taper (law) (not the usual audio or linear taper, it can't be replaced by a normal tone or vol pot). But if you can't locate one, use a linear, not a logarithmic (audio) taper.
Below, how to pass the pot assembly through the f-hole
Note the H39 Hollywood (one pickup) holes are not at the same place. Makes it difficult to convert to H41 two pickups..