clamp stud adaptors

in process of designing a new fabrication bench i decided i wanted to be able to use all my various clamps ive aquired/built over years.
only prob was they used mounting studs from m14 down to m6 about 80% being m12, so thats size ill be tapping holes in bench
so came up with solution below which is prototype to make sure idea worked.
had a damaged machine shaft in scrap pile which was 16mm od, turned 1 end down to 12mm x 50mm long, left 20mm sect 16mm then turned final bit to 8mm x 150mm.

then threaded short end m12 and other end m8.
tried it in scrap metal plate that i tapped m12 hole in to try it, and can clamp down really tight with no probs.

now need to make whole range in dif lengths/threads.
Attachment 791

Thanks naughtyboy! I've added your Clamp Stud Adaptors to our Machining category, as well as to your builder page: naughtyboy's Homemade Tools. Your receipt:

<div id="blocks"> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="/clamp-stud-adaptors"><img src="/uploads/55636/clamp-stud-adaptors.jpeg" alt="Clamp Stud Adaptors" /></a> </div> </div> <div class="head pngfix"></div> <div class="left pngfix"></div> <div class="right pngfix"></div> <div class="blockover b1 pngfix"> <div class="title"> <a href="/clamp-stud-adaptors">Clamp Stud Adaptors</a> <span> by <a href="/builder/naughtyboy">naughtyboy</a></span> </div> <div class="tags"> tags: <a href="/tag/clamp">clamp</a>, <a href="/tag/adaptor">adaptor</a>, <a href="/tag/stud">stud</a> </div> </div> </div> </div>