I'm about to repacking my FMF 4.1, but can't seem to loosen the front end cap. According to the directions you tap around the end cap lightly with a mallet to break the silicon seal and then bang the rear mount until the cap/core comes out. This worked perfectly the last time I repacked it (which was the first time since i bought the pipe), but now, despite banging the crap out of it, it won't loosen. Anyone else had this drama and know how to get around it. I don't want to bang it any harder, or any more, for fear of damaging it. Maybe I put too much silicon on it before??? Either way, any tricks of the trade would be very very welcome.