Brain teaser with M7 bearing balls

UPDATED -- better, nicer, easier to print, easier to solve, harder to fail, more alike original toy i used to have, no postprocess...

brain teaser with two M7 bearing balls. can you got both balls into their holes?
( -- is absolutely impossible to send balls into holes -- there is only one trick to solve it -- no spoilers here -- )

print both parts, insert two M7 bearing balls, slip parts together and glue them carefully.

how to print:
use your favorite transparent filament :)
.4mm nozzle
one layer .3mm, full (you can use ironing)
.3mm vase mode
print both halves 45 deg rotated to get best result (other setup can cause gibbous edges...
20mm/s is enough speed!!

not recomended to try scale it to try pass another balls dianeter, 'cause you will be unable to slip parts together (scaling), or there will be too high will (scaling up) and there is risk the toy will not work properly :(