Summary

Paying 10+ Euro for the adapter looked too much, and when I found someone selling 3D printed version, I decided to try out one myself.
It works really well, try not to over-tighten, since it will break.
The size of the hexagonal head matches the required tightening force.
Tinkercad design to adjust: https://www.tinkercad.com/things/hGPNKn0AZ42-t-blade-adapter

Print Settings

Printer Brand:

Anycubic

                                            <p class="detail-setting printer"><strong>Printer: </strong>                     <div><p>i3 Mega S/Pro</p></div></p>                                                                                <p class="detail-setting rafts"><strong>Rafts: </strong>                     <div><p>No</p></div></p>                                                                                <p class="detail-setting supports"><strong>Supports: </strong>                     <div><p>No</p></div></p>                                                                                <p class="detail-setting resolution"><strong>Resolution: </strong>                     <div><p>0.1</p></div></p>                                                                                <p class="detail-setting infill"><strong>Infill: </strong>                     <div><p>25%</p></div></p>                                                                                <p class="detail-setting filament_material"><strong>Filament Material: </strong>                     <div><p>PLA</p></div></p>                                                                                <p class="detail-setting filament_color"><strong>Filament Color: </strong>                     <div><p>white</p></div></p>

T-Blade Ice Skates unscrew adapter