Need to replace the blend pot on a Lakland preamp, figured that would be an easy find but jeeez, these things seem to be a rarity. Might try to contact Lakland, but I'd like to see if I can just buy one first somewhere, as a I need other stuff too. I've found some solid shaft, but can't use that. I've found some B50K, but this is A50K. Not sure of the difference. So, I need a split shaft, A50K blend pot. Thank you!