That is a good trick putting 3/8ths gear into a 1/4 housing, will have to remember that!.
I bought a stubby 1/4 drive ratchet few months back, fine pitch as well. Works great when you have very limited movement of the handle.
Yes, the Snap-on man could do it in a couple of minutes in the back of the van.
I've never pulled one to bits, but it looks like the drive mechanism is only held in by two tiny screws on the back of the ratchet.
For occasional heavy duty work I have a longish 1/2" drive breaker bar, which we used to call a matador.
Mine is the black impact finish version, which was always a bit cheaper than chrome.
I lent it to a neighbour who was struggling to remove the studs in a Triumph Stag block - they were notorious for rusting in as you probably know.
Fair play to the guy, he told me he would be giving it some grunt and didn't want to risk breaking my tool.
I assured him all would be well.
He managed to wrench out several studs, and also twisted a couple off.
There was then a large crack - his stud removal tool shattered under the load he was applying.
So that was Snap-on 2, Triumph Stag 0.