I feel your pain . Hit the lit with a hammer twice try to undo the recessed lid with a dodgy whist , cut foil out with a knife then try and drain. Complete rubbishPlectrum CCC is a complete and utter shitshow. Foil seals that the cap won't cut and those stupid 10l cans that look like stackable glyphosate cans so are impossible to drain. Also caps are on too tight. Avoid at all costs.
A small pair of water pump pliers is about the only think I’ve found that will open any can. I’ve got a plastic can opener with 2 sizes but it doesn’t fit the rough topped roundup cans
I have something similar to this for opening cans
View attachment 1033697
I’m not in the yard to take a picture of it but one side fits on the lid then the other side has spikes that pierce the foil. You just twist it a little and it cuts it out nice a neat.
I’ve searched google but can’t find one like it anywhere and I can’t remember where it came from. Possibly a manufacturer? I’ve not come across any cans it doesn’t fit so really handy.
I use these and they lock over the platform rail so don’t get lost when not in use