I would recommend drilling stop holes at both ends. You have to be sure that you're getting the actual ends though. A loupe might come in handy for that. Drill the holes slightly beyond the visible ends. Then as you drill and the hole widens it should meet up to those crack's endpoints as it widens. If you drill slightly beyond that, don't worry because in the long run that doesn't matter much, because the crack will eventually meet up with the hole anyway. Drilling slightly too far is preferable to not drilling far enough, so if you err slightly make it in favor of slightly beyond, because sometimes these cracks are not 100% visible at the surface anyway. The tiniest bit may still be invisible under the surface. My favorite size drill bit for this is 3/32". Drill a dimple into the cymbal first. Then put a drop of motor oil into that. After that you can proceed to drill all the way through.

If you cut bronze with a plasma, it will dis-color !! If you go that route, use a lathe !!

But I strongly suggest you take Drumaholics advice,...it don`t come any better in the world !!

Any particular advice on a specific drill bit type? Also what about drill speed?

Just a regular wood drill bit. Warp speed.

...now if I only had a drill that used anti-matter...

thank you drumaholic

i will do it next week . thx

Sure.

And just one more thing that I should mention. You need to use what I call a drill guide just to make the initial dimple. If you try to go it without one you're almost guaranteed to slip and miss the intended area and skate all the way across your cymbal creating corkscrew patterns in the bronze as you go. What I use is a small round piece of anything that I can find that will be slightly larger in width than the drill bit. Think of this as being like a bulls eye for your drilling target. First you will mark the endpoints where you want the drill holes to be with a small felt-tip marker. Then position that drill guide right above that mark. Then make the dimple impression with you drill and just follow the rest of what I said earlier.