Yup, as the subject says, I finally found the time to take a serious
look at the stuck diff lock, and get it loosened up, so it will probably
work again :-) But, as usual, things didn't go perfect this time either.
The servo unit was good, so was the lines, no leak there. The reservoir
started hissing when I disconnected the vacuum lines. The shaft even
loosened without any problem, once I applied some penetrating oil to it.

The small problem was that the pin that connects the servo to the shaft
fell off when I pushed it out, and it disappeared! Just gone, I looked
all around the van, and under the van, I examined every square
millimeter of the frame and the front diff, but it was gone! I started
cursing a bit, but quickly understood that it wouldn't help. I'll take
another look tomorrow when the sun is shining again. The only place I
believe it could have placed itself was behind the flange to the
cvjoint. I turned the axles around several times, I tried to look, but
no luck.

The big problem is that I had no replacement available, and this
happened on a Saturday afternoon. No hardware store open at that time,
and none open on Sunday, either. If I don't find the pin tomorrow, I
will have to wait until Monday before I can assemble the parts again.
Really disappointing, and no new off-road experiences this Sunday!

PerL
87 Syncro 112i