In regards to a hacksaw causing sparks, Useing a brand new sharp hacksaw blade is less likely to cause sparks than a well used dull one. The danger lies within the electric tools we use whuich have brushes that ride the armature that spark during operation. To see for yourself run any one of your tools in a dark room observing the armature through the air cooling ports located over the armature commutator.
Use an old fashion hacksaw with a new blade.
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