I've had my 4343b's for about 20 years and recently re-foamed the 2231h and the 2121h. That was so successful that I've decided to tackle the next step.
I've got a new pair of D16R2421's that I got when I first picked up the 4343b's.
I've read here that after 30 to 40 years, it may be time to refresh the diaphragm...so is there a thread here somewhere that describes how to go about it?
I've got it figured out that I have to remove the upper front blue face in order to remove the 2420's.
Since I'll be placing one of the 4343b's on a shelf sideways, while I'm opening up the speaker cabinet I'll rotate the front 90 degrees, and also move the uhf over to the left side so it mirrors the right speaker. Should be pretty interesting to look at!