I didn't like the knobs on my Akai LPD8; they were too short & shiny. I wanted to use the same knobs that I put on my Polymorph, but (a) the LPD8 pot shafts were too short, and (b) the knobs were meant for knurled shafts and the LPD8 pots had "D" shafts.

Fortunately I was able to make some "adapters" by gluing some thick "cigar" matches together, cutting them down and then gluing them to the pot shafts with UHU glue. I added a bit of heatshrink to help hold them on.

The knobs fit over the end of the glued matchsticks, and it all worked quite well. As long as I don't clout the knobs too hard...