Sawzaw Sex Machine!

[Stromer]

Here is the first one I made. I would recommend not just glueing a blade inside a dildo, to big of a risk of severe injury if something came apart. I have made a dozen or so for friends, typically I use a vac u loc adapter from Doc Johnson. That way you can use any of the vac u loc toys.

Like some others have said use a higher end recip saw with variable speed, the super sawzall in the pics also has a orbital action that adds a bit more than just in and out.
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As someone that has been in the trades for years, PLEASE!!!!!!!!!!!!!!! don't use any modified blades inside the dildo. I ground down a blade, inserted into a silicone dildo and tested it. It only took about 30 seconds before it destroyed the dildo. Thankfully it happened while I was testing it and not inserted in my wife.
And its would be a good idea to purchase a new saw and use that instead of one that has been used on a jobsite. After purchasing the above, we cleaned the dildo and attachment, but she still ended up with a yeast infection from some the dust that was blown out of the saw. She enjoyed that first session, but we never tried it again.