The LHarc file should have contained:

     DOUBLER.PRG    The actual program
     DOUBLER.MAN    This file

This program takes single sided disks and formats the other side of the
disk, making it a double sided disk, without damaging any of the data on
the disk. It is public domain. Copying it is FREE!

The program itself is simple to use... run the program, place a single
sided disk in drive A, and press Return. If the program cannot double
side your disk, it may be because it's already double sided, it can't
read the boot sector, you have bad sectors on the back side of the disk,
or you are using some kind of WEIRD format. If it's a standard GEM disk,
it works fine. I'm not too sure about Twister disks, but it should work
fine with those too. If it doesn't, please send me a copy of the disk so
I can figure out why it didn't work.

The program should run from any resolution, and if you run it by mistake,
just put a write-protected disk in Drive A and it will exit.

Oh yes, one more thing. Don't turn the computer off while the program is
rearranging the data... that's the point of no return.

Hope you get some use out of this. If you would like source code, please
send $5 and a blank disk to:

          Damien M. Jones
          201 East 19th Avenue
          Bellevue, NE 68005
          Attn: Doubler Source