I got a Mag spark stuck awhile back in my TC and Warren Outdoors kindly sent a replacement and advised cleaning after 5-6 shots and I haven"t had a problem till this week.Got my new GM 1-30 twist 45 cal barrel and had a brand new Mag spark (never seized) and managed to get it stuck anyway .I tried blaster /heat/and patience and after a long night managed to strip the allen wrench anyhow .So I got to asking a member here (whom I have a lot of respect for) and he basically said leave it as he never removes them,just keeps the cap clean and the inside of the nipple portion . My question is I have always removed nipples before when cleaning barrels and am trying to get opinions . If I had to remove it I would be trashing a new Mag Spark and I really like them except for the stuck part !