Clamp/clip for outside on greenhouse glazing bar

[Jimmy]

Going to fit a gutter on my greenhouse to collect some rain water.
Worked out I can use 22mm plastic piping with suitable bodges.
Need to secure pipe to greenhouse.
Wondered if anyone has seen a clamp that fits on outside of glazing bar.
I guess I could drill a little hole.

Any ideas
Thanks
Jimmy

[Jimmy]

Hmm I found something that might fit the bill.
Search for "Midget Panel Clamp Set"
Bit expensive , might try and make some !
Jimmy

[Jimmy]

Double Hmm
I have some
White Curtain Track Bracket Whiteline Harrison Drape Wall Swish Rail
I think they would make a nice bracket for my purpose.
Jimmy