On Wed, 6 Feb 2019, Chuck Guzis via cctalk wrote:
  Ratchet right-angle screwdrivers are also an
option, as are ball-end
 allen wrenches or offset-head screwdrivers.? None are particularly dear. 
 After half a century of using the cheap crap, first the stamped chrome
 ones, and then the black ones from Hazard Fraught, I have found one that
 I like:
 
https://www.amazon.com/Victorinox-Ratchet-Swisstool-Spirit-Multi-Tool/dp/B0…
 It's much smaller, sleeker and works well.? You need to flip it over to
 reverse.???? Made by Victorinox (Swiss army knife). About five times the
 price of Hazard Fraught.
 I have NOT yet seen how it withstands abuse, such as hitting with a
 hammer, or putting a pipe on the end to exceed its torque range. 
In a pinch, I've used one of my made-in-China 1/4" ratchet wrench and a
screwdriver bit.  It's about as slim as they come.  My set (from 1983 is
real Chinese--"Laughing Swan" brand or some such.
Looks something like this:
But I like the idea of just supporting the thing from the bottom.  Can't
get better than that from a mechanical standpoint.
--Chuck