Cast in many industrial products have long been used mortgages (anchor) bolts with special heads, such that not only pull, but rotate can’t.
With the advent of high strength composite self-hardening compositions that bolt you can “lay” in the body of the finished product (plastic or metal) and making it pre-nest, and then simonaityte.
Recommend to read
BREAD BOX
An old but wise folk saying goes: "Bread is the head of everything." However, storing it in advance is a hopeless task. It goes stale and dries out very quickly, or even gets moldy and...
NOT A SPRING, ELASTIC BAND
Young people and students again are in fashion bags with metal latch. However, this castle is long due to the breakdown of domestic flat springs. Carefully disassemble the latch and is...