SG90 mini servo to Lego axle (shaft) adapter

A piece to connect SG90 mini servo to Lego pieces. I used this connector for my Lego electrification project. See more details below about electronic and mechanic setup: https://github.com/omuryildirim/lego-42212-autonomy One side of connector is designed for SG90 with 21T spline connection. Usually SG90 models have 4.8mm nominal diameter. I got inspired from my trial to find a Lego piece that can be plugged on to SG90 and figured Lego Technic, Pin Connector Round 2L with Slot (#62462) can be used for that. Afterwards, I wanted to have a stable axle connector and created this piece. The other side of connector is designed for axles pieces like Lego Technic, Axle 6L (#3706) . These pieces have 4.4mmx4.4mm dimensions.