Scirocco Register

I've recently discovered that the inner drive shaft seal us leaking closest to the gearbox. It looks pretty simple but someone said they weren't sure if there is a special tool required as there spring loaded inside when you remove shaft from gearbox.
Is this true or is it a simple job costing me about £5?

You can make a tool out of threded bar, nuts and washers and a metal bar at the end for them the go through, there is not alot of pressure so it does not need to be super strong. I had a problem getting the new circlip back on but found if I undone the middle threaded bar a little the flange would push in more so giving me more room to get the clip back on.
Guide here.
http://brokevw.com/020flange.html
Picture of the tool my dad made, don't forget to drain the gearbox oil like I did or it pours out of the seal..
I did not need the metal box shaped spacers on the middle bar so don't bother with them.