STEP BY STEP
Measure the diameter of your pillar and add 1cm. Using a ruler and compass mark the area to cut out on the base of the shed. This area should extend to a radius past the middle of the shed, so that the pillar is central to the shed.
Use an electric or hand fretsaw to cut out the part that goes around the pillar. Be careful of the reinforcing plastic cross pieces on the bottom side. You may need to go out slightly wider to avoid these. Smooth any rough edges with the sandpaper.
Assemble the rest of the shed according to the manufacturer’s instructions. Assemble the sack barrow if necessary. Place the sack barrow at the rear of the shed with its bottom plate under the floor of the shed and align it accurately with the centre of the shed.
Place the plywood on the inside and outside of the shed and drill eight holes for the U bolts, deep enough that they go around the tubing, through the exterior ply, the plastic and then the internal ply. The wood spreads the load to protect the plastic.
Thread the U bolts through the drilled holes from the outside. Put washers and nuts onto the threaded parts of the bolts and tighten each a little at a time. It’s important to get the amount of tightening correct as over tightening will damage the plastic.
With the shed perfectly placed over the mount, mark the rear corners and a straight line with bright paint showing the way back to the ‘home’ position. This is important as you will be driving blind from the rear of the shed when moving it.