They are little pieces of metal cylinders (usually brass) with threads on the inside and often on the outside too. The inserts get screwed or pressed ...nto wood or plastic parts to give the softer material actual metal threads inside and allow them to stand up to more abuse.Anyway, the machines I ran had five tubes that fed solid metal rods into a multi-station lathe. From the back end, it kind of looked like a really big Gatling gun, but the barrels of these machines were just the feed. They now have twelve grown c***dren. Jack loved to brag about keeping his bride knocked up. He said all he had to do was get a hard-on and she was full of a baby again. Sara always said fucking Jack's thick cock was a pleasure. Since they are alone they have all the time to really satisfy their sex fantasies. They moved to a private sex community where sex was often and fun. They had key swapping and nude sex parties. They also belonged to a swingers club and attended two sex clubs. At the last. I was not used to running on sand as I ran on the street or pavement back home and soon got tired. I sat by the beach contemplating my decision and finally decided to grab a bite and walked towards the beachside bar-restaurant and looked for the bartender.Being morning, the place was deserted. The bartender, with whom Rishikesh had struck up a conversation the previous night, was a young man, still in college and was working here part-time to finance his education. He smiled at me through tired. Not going too far with family intro, let’s get started with real story.It’s been told, as a boy enters the age of 18, his male hormones gets activated, his penis starts getting erect, and in short his sexual urge wakes up. This is general scenario with almost all males. Then, boys start watching blue films, look at girls boobs, talk dirty about girls, and all sorts of things. Well, the same thing applies to me. My sister is younger than me. When I entered age of 18, the all above thing happened.