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1.  Tighten the cartridge hex bolt.  Rotate until resistance is felt, then continue another 3/4 rotation to tighten, never too tight.  Make sure that there is no surface deflection in either cartridge mounting area or headshell area.  The tightness is just 'finger tight' - you should be able to do this with fingers twisting the hex key to prevent excessive application of force.

2.  Make sure that the VTA locking screw is tight, but not too tight.  Some Linn users follow the 'Linn doctrine' to the book and over-torqued the VTA screws.  When VTA screw is too tight, the bass will become constricted, and midrange/treble becomes too brittle sounding, .  Correct torque/tightness is 'hand tight', or 7-9 lbf/in.

3.  The arm base tightness - tight but not too much.  For Rega arm, the ideal tightness is just slightly over what's necessary stop the arm fr om rotating.  For Linn or other arms wh ere bolts are used, the bolts should be 'hand tight', about 7-9 lbf/in.  Also, make sure the armboard should not be deflected as a result of tightening the bolts.

What is 'hand tight' ?  Lock your elbow, just use the hand to tighten the screw/bolt.  If you bend the elbow, you could apply too much force from your whole arm, easily reaching 15-20 lbf/in, excessive for tonearm application.