Two of these rod holder assemblies will hold a 6.3mm diameter rod into a window sill, so you can dangle objects from the metal rod.

I purchased a 6.3mm x 2000mm galvanised metal rod and two ID: 8.9mm x OD: 11.0mm springs for this project.

I used a Ninjaflex cover on the holder foot to stop the assembly from sliding down the sides of the window frame.

Felix 3.1

No

Yes

print the disk shaped object in Ninjaflex. This will slip over the outer holder and prevent the holder assembly from sliding down the sides of the window frame (my frame is very slippery glass)