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Hi John and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, would you then attempt a DIY (do-it-yourself) repair approach?
Still and if yes, proposed preliminary tries (if have not been done) of the only easy user doable:
In some instances, it may be necessary to clean off the old/dried lubricant and replace/re-lubricate.
And it has to be posted that the prescribed repair approach is replace the laser (optical pickup) + mount mechanism; i.e. traverse ass'y.
While it is not that easy to source parts, the traverse / optical pickup would almost always be a Philips part or equivalent. If considering replacing, then please determine and post back the Part Number of the currently installed laser / optical pickup in your Mk I or II version.