Dremel 678 Circle Cutter and Straight Edge Guide, Rotary Tool Attachment, Fits Dremel Models 4300, 4000, 3000 and 8220 - Power Rotary Tool Accessories - Amazon.com
My corded Dremel 300, purchased in 2005. The chuck recently seized and I was able to open the case and easily service the part myself. : r/BuyItForLife
Ersatzteile & Zubehör zu Dremel DREMEL 300 SERIES / MODELL 300-25
DREMEL 300 Series Variable High-Speed Rotary Tool with Case & Manual | eBay