I am using JB Plastic Weld, the best in my opinion, quick drying (5mins) until you don't have to hold together, but 24hrs for a complete set. I have hobby clamps for a great help in keeping the parts together for a strong tight seal. Here you can see the two pieces and how they come together to form the Shin.
A final check and measure of the pin before glue is applied and the pinning put in place. You can also see I've attached the struts from which the Leg Armour plates attach.
Hopefully you have found this useful. Thanks for dropping in.