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the scales or wedge were most likely celulose,it ignights at a very low temp ,same stuff they use to make cordite ,the propellant in old amunition eg 303 etc the only difference is the stuff has...

I think it was Vlad that told me to get into the pivot area dental floss and polish
Regards peter
PS If it wasn`t Vlad and you know who you are I apolagise