Hi, I am using forced downtime for deep cleaning, general repairs and upgrades of my Frankia I840BD. In various locations, Frankie uses recessed round connection blocks wherever the boards connect at a 90-degree angle. In my build, Frankie uses beige-brown connectors for interior furniture and gray connectors in the garage and manholes, which are finished with gray speckled trim. I have included photos of the relevant part, but I am trying to buy spare parts. I've found them on Hafele's website in the past and even bought a box of connectors and caps, but during my last garage cleaning they seem to have turned into walkie-talkies.
This is a good question, last month, I was looking for the exact same Frankia furniture board connectors in my area, didn't find any good models, so I tried to find a good online shop with those models. Hopefully, by my friend's suggestion, I found this site furniturevogue.co.uk with a good range of furniture board connectors and other furniture-related things. Check the link I sent above, and I'm sure this model will fit your needs. Have a good day and stay safe, sheds!