Souunds like it is gripping at the back.
Check adjustment of point 6.
check it is inserted correctly, and check it is not to tight.
'
with out the reg in place the window should slide smoothly downwards just by gravity
510 Drivers window comes down wonky and wont go up properly.
Re: 510 Drivers window comes down wonky and wont go up prope
"It's ok, we know what to do...we talked about this a lot on the internet."