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I've had a result, and with some time and patience managed to release everything on the Vitus that was corroded and stuck: Grub screw / seatpin / saddle in seatpin / stem in headtube!
The worst was the seatpin itself in the frame, closely followed by the grub screw. What worked for me was to soak, regularly, and over a period of time with "Crack It", which is a very cold high pressure spray can which I picked up from the local motor factor.
Then, I hammered a oversized Torx bolt (bought individually) from the same motor factor into the rounded grub screw allen head. This was really hammered in. Then, simply a 10mm socket on the end and a ratchet wrench to attempt to move it. I'd give it a nudge every so often and with repeated sprays and tugs on the wrench - it eventually gave way. In the end, once it had started to move, it came out pretty easily!
The seatpin also got the same freezing treatment - this was an original alloy Vitus seatpost in an aluminium seattube. This was very tricky to remove and I could only move it very slightly left and right to begin with. A trip to my LBS gave me the second pair of strong hands that I needed to simply get it twisting with brute force. Eventually, I'd been able to twist it round several times, we could eventually work it out of the tube.
The stem was again, the same as the seatpin - liberal use of GT-85 and the freezing spray. Eventually, a few twists of the stem against a wheel held between your legs and we got it to crack free and start moving. Once you've got even a tiny amount of movement, it will come out.
I've now deleted the pics that I uploaded into another forum, so here's a link if you wanted to have a looksie...
http://www.retrobike.co.uk/forum/viewtopic.php?f=12&t=264724&start=10
Dead pleased to have everything freed up and released - what a pain in the backside!
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rjsdavis
As long as the thread is ok this should be fine. Don't shear the easy out though or you will have problems. In my case the thread was ruined when I got it so I had no choice but to go bigger.