Molly - for years, I used my 3/8" electric drill held in my bench vise as a poor man's lathe. It works. I even 'turned' a nipple that used small pistol primers - like the ones from the late 1800's - early 1900's used in competitions and pictured in Ned Robert's book. I used files for turning the steel to the diameters needed for threading. It is interesting on what you can do at home with a minimal of tools, if need be.
Turning jags smaller is such a breeze with a 3/8" or 1/2" drill held in a vice. 1st thing is to cut off the brass threads, centre-drill, tap to 8x32 or 10x32, then insert and CA a steel threaded shaft - the end of a long machine screw. Then, holding the screw in the 'chuck' of the drill (in the bench vice) turn with a fine file until it is the right size for double patch. They really do make a difference in the cleaning of the grooves. Course, with a tight ball/patch combination, there is no buildup, anyway.