I made this small screw on attachment for my Dremel like tool, that allows me to cut perfectly round holes into MDF plates. The bottom plate in the picture has a pin hole positioned such, that it can only cut holes of 33mm diameter using a 3mm end mill bit. There is also an additional STL file of a bottom plate that allows arbitrary pin positions. The top (screw on) plate has four holes designed for M3 brass inserts of 5mm x 5mm outer dimensions. To assemble the attachment, you need to print at least 3 sapacers and you will also need 3 or 4 long (say 50mm) M3 screws each with a washer and an additional smaller M3 screw with 2 washers and a nut, as a cetering pin. ** Tips and support kindly accepted here: https://paypal.me/ZigaM3 Or with LBRY (LBC) credits, through my Odysee channel: https://odysee.com/@ZigaMDIY:9 I also design on redbubble: https://www.redbubble.com/people/reintegration/shop And I promote my RB designs on Pinterest: https://www.pinterest.com/reIntegration42