Yeah they were really tight. Definitely used the right sized metric hex key and ring spanner to hold the nut. On one of the bolts I stripped the hex key AND the nut completely so had to drill it out.
And I'm not using cheap tools either.. I bought a $360 hex key and socket/spaner set... I guess the bolts have just deteriorated after 20 years so I'd like to replace them rather than stick half-stripped ones back on.
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