How to tighten Helius Scorpio 1 components

Hello,

I run into trouble to tighten the fixation of the lift,the antiskating and arm standby...

Please have look to the picture enclosed,the second one at the rear shows the hole where you can guess the main bearing allowing the arm movement.. (1)
So ,the support of the three mechanisms listed upside should be fixed thanks to a screw probably hidden by the bearing .

I've tried to dismounting the parts but I failed and i suspect the needs of a specific tools to operate...

Should you own the same arm, please let me know if the mounting looks to be similar

Thanks in advance for any advise, I do not have the adress of Helius service...

Kind regards

Raymond (from center of France
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