I recently replaced the faucet in my office washroom. The new one wouldn’t flow enough to activate my tankless water heater.
I thought I’d just remove the faucet aerator screen, but the entire outlet of the faucet was an assembly with a flow restrictor and aerator all in one. Running the faucet without that assembly splashed water all over the place.
Careful application of a hot soldering iron melted a hole in the flow restrictor. It was kind of nerve wracking because one false move would ruin the whole thing.
I put it all back together and now it works great.
I was able to do much the same with a shower head, many moons ago. :-)
Unfortunately, while the aerator in my new faucet is easy to entirely remove, it doesn’t affect flow rate much. No splashing with it out though (due to the slow flow.)