I printed 2 of the "British Garden Bird Feeder": https://www.thingiverse.com/thing:2769428

One of them got a metal mount which fits by random The other one will be mounted using a 16mm diameter bamboo tube and this platform.

The vertical holes are used to fit the bird house with thin cable straps or garden wire. The 2 horizontal holes will be used for fat balls.

I added here also the Fusion360 f3d files if some like to modify the platform for different diameter, designing an adapter tube or to use it as an open platform any maybe adding some grab pole for bird foots.

I added also an add-on, the bird feeder rod for birds which like to sit in the basement eating some fat balls :-) There are 2 versions, one with a 4mm hole and one without. Both have 17mm diameter hole.

Artillery Sidewinder X1

Doesn't Matter

No

0.2mm

25%; maybe 10-15% is ok