Anyone ever add a drain plug to a torque converter?

Bewy said

Use a 1/8" NPT plug. You can also drill a 1/8" hole & let the fluid drain. After draining, use a 1/8" pop rivet + silicon to seal the hole.

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Pop rivet fits nicely but how do you get it to seal? Remove the middle and fill with silicone or just smear it and tap it in? I am assuming you are not using the gun and hammer it in.