Thanks all. Good suggestions. My actual purpose for these are for a belt driven table saw motor (sorry I snuck into this great router forum with a table saw question) used occasionally in a tiny garage workshop. The motor sticks out in the back big time. Motor is mounted on a two-rod support that slides back-and-forth for tension adjust. I added a HD plug strip at the location (bonus extra receptacle for shop-vac auto-on with saw) and when I'm done with saw I pull the plug, loosen the mount + motor, pull it off and store it on the wheeled base. Now the only thing I run into is the fence clamp lever. Ouch!
Originally the motor was held with 5/16" bolts. The lift-and-turn things are OK but not as good as these things that Mr. Smith identified as table lock handles. I am looking for quick and tool less removal of the motor because every time I mess with it I get mad I don't have a bigger shop! Soon as the garage warms up I'll probably cut slots in a bolt and make my own. Seems none of the table lock handle folks state the thread size. And the cost is up there.
And the darn carriage bolt I need for a swivel base on a vise.... The vise is a old Littlestown that somehow lost it's clamping stuff. 7/16" is absolutely the correct size for the bolting. I used a 7/16" NC and as expected it is too coarse a thread to provide adequate clamping. And again - no vise companies state the size of their replacement hardware for their swivels. The picture shows the 7/16"NC rod coupling (with a black sticker on top so it looks cool) presently in use.
Please forgive me for these off-subject questions, but this forum is without a doubt the most informative group of insanely smart people I have ever found.
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