Not worth the money if you ask me.
There is a hole on the side of the Bearing Buddy copy cat to allows excess grease to come out if you overfill it.
You should just tilt the gun to the side to release. If not the tip needs adjusted.
The tip should screw in and out
I use the Locknube fitting adapters. I have a Dewalt battery operated grease gun and several manual grease guns.With multiple tractors, trailers and attachments the Lock n lube tips make life easy.Locknlube.com