A bit of background first.
Back then I was always looking for new ways to please my cock. Girls were always on my mind & so was masturbating. Summer vacations were my most enjoyable due to being by myself a lot and able to jerk off as much as I wanted.
I remember spending one whole day masturbating from the time my dad left 'til just before he came home, about 8 hours. I must have used half a bottle of vasoline that day. For fun I counted my orgasms. Nine that day! Although I did not ejaculate much cum after six times the feeling got hugely intense for the next three.
I was very mechanical & liked to work with my hands. One day while in the garage I was looking at a hand held jig-saw & noticing how I could regulate how fast the metal end went in & out. After some thought I rigged a piece of water pipe insulation onto the end with duck tape. The insulation was the black foam type that was cut down one side.
No one was home so I took it to my room to watch porn tapes at the same time. I stuck my cock in the tube & turned on the power very low. It was great. I had made an electric jerking off machine but it was very loud. I did not care much then about the sound being alone so I turned up the speed. I never had such a wild feeling in my cock before & I came in about 15 seconds.
I took off the tube & kept it in the garage hidden for the next time I wanted it. I only used it one more time because it made me cum way too fast.
A few years later I used the same tubing on a vibrating corner sander. That was a great feeling & it would last longer.
Be careful if you decide to do the same. Keep the insulation about a foot long so it is not close to your cock once it is fully erect.
Try it & enjoy. Reply if you will please.