Hi I have a Fobcobench drill for 40 years and had the same problem,and thought a lot about finding a way to get a low bottom speed,but never found an ideal solution as the speed changing must be quick and easy to operate,and there is not much room within the existing belt guards to mount a speed change system.about 15 years ago I solved it easily,I went out and bought a surperb Meddings one inch capacity 3 mt pillar drill in very good condition ,bargain at £320  solved all the problems as its got a two speed gearbox plus five belt speeds,of course you could used an electronic type speed control of the motor of your drill,but it can cost as much as buying a drilling machine,I got mine in the last recession and now might be another good time to find one.Aother way would be say find another smaller cheaper machine and arrange a system of belts  with a counter shaft to get a single speed of 100 rpm and only use it for low speed jobs,it will not take up too much room

regards.

Uncertain of the source of this one but I think it was on Google’s Popular Mechanics/Popular Science magazines archives

 

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