You won't cause any damage, just tap it on a bench vice of similar hard surface a little at a time until the gap is around 0.6mm, there's no magic right or wrong just what works and doesn't, the major advantage of these is they take less energy to fire, but are much less tolerant of rich mixtures than 071 for example, work well considering what a shit material iridium is as a conductor of lectric!!
tabetha