Drain holes under Schleicher seatpans

Now that I have my seatpan out (again) ...

My Ventus 2C had a drain/vent hole in the fuse directly under the
seatpan, about 6 or 7mm diameter. At first I wondered what it was for,
because nothing ever came out, so I kept it taped over.

After I got delivery of my new ASG29 in March, my first flights with
ballast leaked a significant amount of water into the cockpit, and I
immediately understand what the hole in the V2C was for.

So I'm wondering ... should I drill a hole in the Schleicher for same
purpose? My leaking problem seems to have been resolved by using
larger "O" rings on the drain plugs, but if it leaks again, I have no
way of even checking if there's water, much less draining it.

I'm inclined to poke a new hole unless there's a compelling reason not
to ...

2NO