I decided to use trim to clean up the edges and create a border around the PC footprint.

I ended up using chrome car door edging I found on Ebay. Adding this was quite easy and only involved clipping the edging on and then cutting the corners on an angle to line up with the other pieces. The edging came with glue on the inside so didn't require any other fixing.

There are two rows of holes I cut. One to attach the angle bar to the desk frame and one to attach the angle to the tread plate.

I marked out each hole approximately 50mm apart. This was probably too close as I ended up using a lot more bolts than I needed to. You could get away with 100mm spacing easily.

After marking out all the holes, I used the punch and hammer to dent each mark and then drill using a 6mm drill bit.

I then clamped the angle bar to the tread plate making sure it was flush and drilled through both angle bar and tread plate with a 6mm bit. I left the trim on while doing this to ensure that everything would line up in the end.

I then took everything apart and used a 9mm drill bit to make the holes in the tread plate bigger. The bolts I used have flared heads – this allows them to sit more flush than with a 6mm hole.

Using a large drill bit and the round metal file, I smoothed the edges of the holes to takeaway any jagged edges.

Drilling the holes into the desk frame involved bolting the angle bar to the tread plate and then clamping it to the frame making sure everything was flush. I was then able to mark and punch each hole on the frame ready for drilling.

To thread each hole with the 6mm tread tap, each mark was drilled with a 5.5mm drill bit. This allows the angle bar to be screw directly into the desk frame.