Hi William
I destroyed the original rubber cover within the first 30 minutes or so of using the machine. it has been replaced by a piece of leathercloth which I find to be very effective and have only replaced once in the last 10 years (due to be replaced again in the near future). I have only covered the top of the knee and left the vertical column uncovered as i find that i use this space for a magnetic clock stand on occasions. Replacement of the original thick rubber sheet has given me an increase ib Y-axis travel.
On the subject of the X-axis DRO scale, I have mounted this on the front of the table, using the original slot intended for the table stops. I have made a new stop-bar and stops which fit outside the scale. You will find some pictures and a brief description included in a post by 'Steve Talbot 1' under the subject heading 'Using DROs' posted 30/05/2011. I also wrote this up for MEW, and it was published in issue 196.
Hope that this helps
Roger