More fun with windows....

The windows that are able to be removed from their tracks (in other words, the ones with broken cranks), have now been resealed.  The ones that still have the crank attached are proving to be a bit of a pain.  We can't figure out how to get the crank off the track that runs down the middle of the window.  Because that crank is still attached, the glass can't slide out.  I'm about to just fix the seal with the window attached, which will probably be tricky, but not impossible.  It's frustrating because I'm sure the answer is simple...but I'm getting impatient & irritated....surely it's not rocket science!