CCW-20 is a bit on the small side for an intensity of 12-16A. The velocity needed to yield this intensity is very high and you may be abusing the part surface rather than peening it. CCW-28 or larger would be a better choice. A 12-16A in a 1/2" hole is rather strange to begin with.
Last edited by Walter; 06/14/12 12:43 PM.
