Yes, I'm new to reloading...

I built a bench from 2x4 and plywood, intending to use it for general purposes too which means removing the press occasionally. Just discovered that the RCBS base is made so that you can't put an ordinary washer on the underside when using 3/8 hardware. Should I take a piece of flat steel and drill two appropriate holes close to the edge, it doesn't seem right to not use a washer when the fastener bears on a soft surface. Obvious a lot of the force will be directed into the lower part of the base, but shouldn't it still be firmly attached at the base? I could be over-engineering and under-beveraging this project