driveshaft removal problem

[Spitfire]

cheers lads,
Im having some pretty stupid problems with changing my burned clutch on my 86. I was trying to remove the driveshaft as the service manual says, I removed the 4 bolts connecting the cardan with the diff and removed the center holding brace (sorry I have no idea how to name that thing in the middle that holds it ) but hey, the driveshaft is still holding in the place (LOL). the problem is at the diff part, it feels like its still bolted on, no matter that I removed all the bolts that connect it. any ideas what can it be? anyone of you experienced the same problem? the manual says it will simply fall out as soon as you unbolt it

thanks a lot people for helping me out