I just went to pepboys and got one of those dent pullers. I had to do it three or four times but it got the dent out, i was happy & for 20 bucks it is not bad.
I have a 750 K1 and the k3 450, love them both, the 450 is good because the warm up time is less 1 minute vs 3 or 4 for the 750, i guess its because you have to heat up that oil in the external oil tank seems to take longer.