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ha ha ha don't use a rattle gun, but here, put this on the end of it and give it a whack with a 4lb hammer till it comes off?!?!?
I'll stick with a rattle gun me thinks.
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Often there is no space to use a rattle gun and the power bar turns the single required hammer blow into an unturning motion without spinning the pulley.
As they say here
http://www.tooldesk.com/automotive/P...oval-Tool.aspx
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Generates up to 600 ft. lbs. of force which exceeds most 1/2” drive impact guns
• Bi-directional force loosens or tightens bolts
• Saves repair time – no need to remove parts to access the crankshaft bolt or harmonic balancer pulley
• Use where impact guns won’t fit
• Impact force ‘shocks’ bolts loose
• No compressed air required for operation
• Use with impact sockets
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But yes I would stay away from the hammer or slogging ring spanners; I see rounded bolts as a likely outcome. Also the risk of missing or slipping off the spanner and hitting the radiator, your hand or some other expensive and vulnerable part.