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Actually my troubles are about cutting nuts with dremel because they are corroded with hexagon lost...
Yes, maybe splines?
Well could be possible because the head if still very corroded seems to be round and not hexagonal...
Thanks for answer, but maybe i realized that you are talking about 997 but i got a 987, i believe in my case i have threaded flanges...
Got same problem here, just one info to understand how to procede: headers flange are threaded? I mean, bolt are screwed into the flange or they just pass through? Thanks