Thank YOU, Scott! My PK DX is still in temporary 'bomber' mode; so, it was easy to remove existing rear wheel. Besides, it has a super beautiful and comfortable, Leather Seat, from S.A. of Monrovia, CA. It also has a 1/2" inch chain; so, I removed two tonight... the one that started this mess [from PK Phantom restoration] came off with a loud report... however: I'm not BIG enough to apply enough steady pressure, I guess. I had to jump on it a couple times. Then, I tried the other one with 1/2" sprocket: I had not soaked, beat, or otherwise tried too hard, on this one... I couldn't budge it... so, I removed the right pedal and stuck my favorite 4' length of 1" cheater-pipe on the crank arm. A few jumps and another loud report...DONE! Now I wonder that this design even needs a 'lock' collar!
Scott, should this thread be moved to 'Restoration Help', to maybe more easily help others?