Brompton carrier stretch hook

The original broke - let's reproduce!
The original has no possibility to insert the (2 tied) strech bands so I added a slot. It's very tight but when you stretch the bands while pressing it through the slot it goes through pretty well.
Printed without support, hot with PETG, 5 perimeters and 30% infill for hight stress resistence - seems working as good as original. However, I just made it - no real life test yet..