Bottleneck 555's 0.2A Stuck project

[121434244]

Hello

I made this: (555 pwm, but it has a bottleneck because I can't use higher load than 0.2A)
http://www.easterngeek.com/2008/06/simple-and-dirty-pulse-width-modulation.html

How to easily mod it to accept more current ?
1.) list what components to add.
2.) a drawing how and where to solder these extra components.

I hope it could handle:
Voltage input: U=6-12V (I use different battery packs)
Current draw: I=10A (max.could be less for geared motor 12V)

Suggestions
and easy to understand guides so I can solder the "add-ons" myself.

[dvhenry]

http://home.cogeco.ca/~rpaisley4/LM555.html#32