This video looks at using Gerber (4C) to ask for aces, as an alternative to 4NT Blackwood. It also discusses using 4NT as a Quantitative Slam Invitational bid.
I use Gerber the same way as you do after 1NT or 2NT openers - although to be honest I use 2NT - 4C as something else - hence I haven't used Gerber in the last 25 years 🙂
I use Gerber the same way as you do after 1NT or 2NT openers - although to be honest I use 2NT - 4C as something else - hence I haven't used Gerber in the last 25 years 🙂