Umbrella holder bracket for IKEA TVETÖ

This is a 2-part bracket I designed and printed to attach an IKEA TVETÖ umbrella to our balcony railings.

I'm not sure it'll be helpful to anyone but maybe seeing it will give others ideas. 

I printed 2 sets of these to hold the umbrella steady.

I attach the 2 pieces together with 2 zip-ties and that seems to be strong enough to hold well so far.