They tell me that when sanding pieces of metal tubing with a flap-disk attached to a 4-1/2" grinder ... you should clamp the metal in the vise -- instead of holding it in your hand. Otherwise it is very easy to sand away a few layers of skin faster than you can let go of the grinder switch.
There's the current frame configuration.
I'm trying to decide if I want to make any alterations (such as boom vertical angle) before continuing on ...
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