I have the B-24. It’s a pretty instrument and the sound is great, the best I think; but it’s very hard to play and seems to have gotten harder. There was some leakage, so I took it apart a few months ago and rubbed silicone grease (Trident) into the gasket. That helped a bit; but the air chamber, if I’m recalling correctly, has a rubber outer wall that expands and contracts, and I think that’s the real source of the problem. That would likely be the source of the delay issue. I wonder how much difference there is between the Hammond and the B-24, other than the pickup.