I thought that someone might come back with lead by example tell us how you did it!
Due to these dents, these were sounding almost like dark chinas or something. They lacked resonance and generally did not sound good.
Well, unfortunately I did not take any pics. I can tell you that these were both HH cymbals and that one of them had a dent that when you push on it to get it out, it only pops back when you release pressure (I pushed on it to 'fix' it).
So, I decided to try to fix it permanently. First, I was not afraid to get the hammer out as they were truly useless because of the dents. I did not want to just use a hammer because that would likely just create another small dent. So, in order to spread out the impact, I used 3 can lids stacked together in the center of the dent (which was about the size of a baseball or the size of a fist). I first started by placing the cymbal on the couch - which proved to be too easy on the cymbal and unfortunately it made no change. So, I then decided to lay it right on the carpeted floor. That helped - and pretty much did the trick. I was not afraid to really give it a wack though.
With one of the cymbals (the one that was popping back) I modified the technique and I struck with no lids right about 1 inch from the edge - as these dents would cause the cymbal to appear (in that area) like one of those model of cymbals that are flat in the outer half. So, I used a ledge (raised threshold in the floor) and pounded closer to the edge there and it essentially created a curve there towards the edge - fixing the dent.
I hope you can visualize what I have described.
One of the cymbals still sounds a bit inferior to what I would expect (2002 SE top) but the other (404 SE top) sounds exactly what I would expect it to.
The 2002 SE now is a very good top for heavy music. ...and now the 404 top is pretty much good for anything - and proves to be a good Paiste wet washy top HH. Now the bottoms make a big difference and I try several bottoms (SE and reg) until I like what I hear.
I am so happy with these results that I have decided to call off my quest for some 505 HHs. They are just too darned pricey now too!
I hope you all can visualize and this can prove to help somebody. If your cymbal is already dented, it is useless anyway - don't be afraid to try a repair. Just spread out the impact with some can lids and also start too soft and work your way toward just right - as too hard will likely create another problem.
John