stick yer engine on top dead center first.
now take the cam gear off. now look inside and see if the tensioner rail
is worn or damaged. we are talking about the curved rail, right?
ok, you now can also see if the pin is moving while yer trying to
tighten the 6mm bolt into the hole of the pin. if it is then
you need to tap out the hole. if you twist the rail hard it should
be enough to hold the pin so you can tap it out. then go from there.

george