All year round
Stand the log for the boot scraper upright and saw off a third, cutting vertically down to make a flat surface.
Stand the larger piece of wood on its flat side and saw two parallel lines about 10cm deep along its length. They should be a few millimetres apart, slightly wider than the width of the slate.
Use a chisel and a hammer to remove the wood between the lines, creating a channel for the slate to sit in.
Slot the slate into the channel so it protrudes about 10cm – cut it to size if necessary.
Remove the tile and squirt a line of wood glue along the channel then push the tile back in. If the tile wobbles, insert some small pieces of wood into the gap to hold it firm.