[spldart]

Dunno if you want to try this....
But to install a new tube.
You need two tire irons and a bed.
That's right... A bed.
Has to have feet not rollers.
I pull the valve from the stem flattening the tire.
I then pick a side I'm going to unseat the bead of the tire.
Obviously the wheel is completely removed from the bike.
I set the bed foot on the bead right near the wheel.
I then sit down hard on the bed corner unseating the bead.
You may need to repeat a couple times to get the whole bead off one side.
Then the tire irons are used to pull the bead OVER the wheel edge.
Tons of youtube videos on this.
R and R your tube *youtube* again
The tire iron your bead back over the wheel edge careful not to pinch the new tube.
Lotsa youtube....
Inflate till the one side bead reseats then back off air pressure to factory spec.