Here ya go- the shape & length are clearly different, but the middies were 1/4 inch longer... at least, that's my understanding.View attachment 1761501
Unfortunately, I hate to report that is not correct (the belief that the midgrades are longer than the heroes)…they are roughly identical in size (with small variances as hand-made objects).
It appears that Ron’s current shells are still running far too long and require a “cut down” of both the Phaser I and Phaser II for accuracy.