OK here's the best shot I could get. Each little foot you see on the finger slide has a corresponding rectangle slot on the shank of the fork piece and they assemble like a plastic locking mortise and tenon. This snap locking assembly has a small spring that is barely visible in the image, this fits into slots on the outside center vertical bar, located in the center of the round vent. The assembly must be built around said center vertical bar. The fork tine portion is fed in via the vent front and manipulated into position with a small pick. Next the spring is placed and capped by the finger slide completing the outside assembly, then the snap together has to be accomplished by more pick and hold work through the front vent. Hope this helps, tough to get a good shot of. If you practiced dry a tiny drop of glue would fix an otherwise expensive piece, I will report on the cost of the item when I get it.