Hacking a C wire

full image - Repost: Hacking a C wire (from Reddit.com, Hacking a C wire)

Hello "Nesters" !My furnace has no C wire. It's a dry circuit however the inside transformer provide 24v to the furnace controller.Can I safely leech a C wire from that same output to my thermostat ?1 circle on the left is the 24v output, 2nd circle on the right are the 2 dry wires to my thermostat.

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