the barrels are a piece of piss fella, rubber/beech mallet old tea towels, concentrate on the barrel portion with a slight twisting with the odd tap to the side of the fins working around, once the old seal has broken and it starts moving it will come easy enough.....its all about protecting the large fins as already said they are scarily easy to snap off..... a little penetrant at the base wd40 and the likes may also help....I had one barrel in one of the spare cases only relinquished its grip on the third day of bashing the crap out of it :lol: