T-Slot mounting hardware

I have been struggling for an hour to create a proper joint between some T-slot profiles and an angle bracket With Solidworks mates this

Manufacturer of Die Cast Bracket

the discovery slot png Inside Corner Brackets Inside Corner Brackets These L-shaped brackets install on the inside corner where two perpendicular profiles meet, and

treasure of tengshe slot 45 series T-slot inside corner brackets & gussets are designed for use in 45mm T-slot framing systems, offering robust right-angle connections