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How to drill a tile in its center when you do not have a trepan.

Drill a tile in the middle

In the absence of a drill, trace the contour of the cut on the tile deposited on a board of agglo (maintained by a Gaffer type adhesive).
Drill a series of close holes (with a concrete drill).
Detach the piece by banging with a glazier's hammer and deburring irregularities with a soft semi-round file.

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