I have a 94 Dodge Grand Caravan with 217K miles on it.

It was doing pretty well until today, when in the rain, the rear wiper did
the "Point to the Ground" thing.

After playing around (and blowing the wiper motor fuse, especially when it
insists on trying to clean the trunk lid and not the window) it appears --
after pulling on and removing the wiper arm -- that one of the parts is
stripped:

There is a knurled rod coming out of the wiper motor/gasket/window, which
appears to be a press fit on to a cap which fits into a larger knurled
socket in the wiper arm itself.
It's the interior of this socket, the one that goes over the knurled motor
arm, which appears to be stripped (at least the interior is smooth -- I
don't know if it was always smooth, knurled, or glued). This larger cap
socket has some sort of flat retaining mechanism to keep it from coming off
the motor shaft (or course this doesn't work if the shaft socket itself is
stripped).

My questions are, for any one who has a manual or has done this repair:

1) The motor seems to be OK. Left on it's own, w/o the wiper arm attached,
it definitely does the correct back-n-forth motions.

2) Will buying an new wiper arm solve my problem?

3) From what I can see, there in no way to remove the wiper arm socket (that
has the retainer clip) itself. So I'll assume that a new wiper arm contains
this socket and it's my job to press-fit a new arm/socket assembly over the
motor shaft.

3) Based upon what has happened so far, the wiper arm to wiper motor shaft
must be a pretty tight fit. How do you safely press-fit it back on the motor
shaft w/o fear of doing harm to the lift gate glass?

Thanks in advance.