what are your opinions on reusing the old plugs ?

I want to provide this all with lowest cost to the end costumer (the machining).
if I have to purchase the corners, that has to be than taxed both when I import, and when the next buyer takes it (especially on "one off" basis, where its very hard to justify tax exemption paperwork), and also I would have much more money "invested" in the whole.

But I have to consider simply purchasing few sets of Mazda and get a good price.

Not a wearing part so I see no issue reusing old plugs .

failed to read properly; my dumb bad

they oscillate back and forth rotationally with the apex seal (it’s not static at all) in addition to the apex seal sliding in and out from the springs underneath keeping them in contact with the rotor housing face (except when ski jumping off spark-plug mountain) and the corner seals also have springs keeping them in contact with the iron side plates, all while the rotors orbit at 1/3 the engine rpm level.

but as you will …
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We are talking about the plugs Team ...not the corner seals.