This diminutive calculator came in for a good cleaning and needed new rubber feet. It worked, yet just a little slow. When I opened it up, ta-da! Old gunky oil and grease plus a smidgen of dust and dirt.
Off to the solvent station and the years of gunk just float away like yesterdays meal. Unscrewing the old feet was the hardest job, as each screw stripped its threads clean away. I hate when that happens.
On the other hand the new feet with mounting screws are a perfect fit.
Once re-oiled and put back together, the action is lightening fast and a joy to use.