Well, if it was like mine........a BEAR!!!!!!!
Rather than try to remove it, I'd just blow a hole in with a torch to reach the nuts.......and, if you want to balance it back out......blow a hole in it 180 degrees on the other side and try to make them close to the same size..
What I did and even then I all but gave up! I took a torch and blew three little holes in it to put an old Ford axle puller on it..........these pullers can exert a LOT of force but it wasn't enough to remove the jumper. I heated and cooled it....PB Blaster.....used candle wax (probably the best) and beat on the axle puller with a pretty good sized sledge hammer...........towards the end, I knew it either had to come off or the whole hog was shot.....I finally took some VERY, VERY hard blows to it and it popped off on about my last attempt before giving up.......then, the gear box acted funny and I though I had chipped a tooth.....luckily I didn't....
I put a LOT of never sieze back on it when I put it back together, so the next time should be so bad......
Hopefully your's won't be so tough......
I can remember, but isn't there a hole already......no, I think that's from the top side to acess the blade nuts......
I don't have any pics.......
Good luck, if I can help, feel free to contact me....