Alright, here's what you're going to want:
First off, I'm not sure if you ment to say 6.04, but that's the correct diameter you'll want. Not 3.04
Next up, get a PDI 270% Spring , They're consistant beyond your wildest dreams
Then grab some Classic Army Reinforced gears, or System Reinforced
Bearing spring guide
9.6v battery
and finally, a big enough motor to pull that spring back.
Cheers.
First off, I'm not sure if you ment to say 6.04, but that's the correct diameter you'll want. Not 3.04
Next up, get a PDI 270% Spring , They're consistant beyond your wildest dreams
Then grab some Classic Army Reinforced gears, or System Reinforced
Bearing spring guide
9.6v battery
and finally, a big enough motor to pull that spring back.
Cheers.