Stuck/Seized Mag Housing... Any Tips??

[cartmel808]

My 1st foray into lammie engines so this may be something of my own doing... but I've started to strip my GP 150 engine and when I've come to removing the Mag Housing it won't budge!
I tried 1st with the T spanners which progressed to instantly strip the threads in the extraction holes...
I then tried applying a bit of heat around the casing with blow torch & tapping around the housing with rubber mallet but still wouldn't budge... Ive even tried hammering the crank through from the sprocket side to drift the mag out - this got it to move but only by about half a mil & it's still well solid!
Any suggestions please??


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