I made this little helper for bolts on water pump on Daewoo Nubira, when everything I new failed. It worked well. Also WURTH ROST OF is much better that WD40 on corroded bolts and nuts.

It could be made from hex nut drilled to diameter of the bolt head needed and the grab screw holes drilled and tapped to the sides of the hex.
I use dremel tool to grind the flat side or sides (for the grab screw to sit on) it would depend from how good is the access to the offending bolt.
It could be made from hex nut drilled to diameter of the bolt head needed and the grab screw holes drilled and tapped to the sides of the hex.
I use dremel tool to grind the flat side or sides (for the grab screw to sit on) it would depend from how good is the access to the offending bolt.
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