I owned that almost exact (switch looked to be in a different position) router bought in around 1984. The switch went bad and was able to find the exact replacement on E-Bay for something like $8 about 5 years ago. I used a "table top" router table until 2013 very successfully. Think it was a Sears table, but do not remember having three holes for mounting from below. Rather, recall it having three strap clamps that connected to three grooves under the table via bolts and wing nuts provided with the table. These clamps locked the base; without the plastic face, to the underside very firmly. It have a grooved top table with adjustable fence segments. The legs were angle steel with holes in the feet for bolting to a larger wood base, or clamped to a surface. I clamped it to the table of my Sears radial arm saw of the same vintage many, many times. Used it very successfully to make a executive design mahogany desk with a lot of custom moldings in the early 1990's - with care it will not limit what you can do for a long time. My son currently has the router and table, unfortunately it'll be some weeks before I could photograph for you. Suspect you could find something compatible on E-Bay, etc.