Front Sprocket Axle Sleeve

[Solon]

I was working on changing the front sprocket oil seal, altogether with the push rod seal and gear pedal seal, and I thought it would be a good idea to change the sleeve behind the front sprocket, protecting the axle between the sprocket and the bearing. I mean part 14 in this chart: http://www.bikebandit.com/1997-triumph-tiger-885/o/m147367#sch561419
I changed that part on my KTM and it was very easy, it came out by itself, but this one seems stuck like hell there. And, if, at the beginning, I thought the old one didn't look so bad, now, after failing to remove it, I managed to scratch it so now it's mandatory to change it as it would ruin my new seal.

The only idea I could thing of was to use a grinder to make two small cuts in it and then hammer it out with the help of a screwdriver or smth.
Has anyone changed that ? Is there any special tool to remove the old one?