On 20/02/2018 15:46, PeterC wrote:
Sounds like the OP may not be very experienced, so might not have one.
Does the "spike" of the current one come out? If it is just earth at the
bottom (check with a stick or suitable metal poker), you can probably
hammer the new one to a suitable depth, once you have enlarged the hole
in the "tiles".
Depending on exactly what the "tiles" are, it might be easy enough to
enlarge the hole using a cold chisel, provided they are not laid on
thick (or strong) concrete.