The type of stringer I'm talking about is a long cord with leather(or whatever) cups on each end that slip over each tip of the bow. You stand on the middle of the cord and pull up on the bow's handle to make the limbs bend enough to slide the string loop over the top end string nock. 3Rivers, and other archery suppliers offer these.
I believe the type Marc has is a static wood platform with moveable pegs to hold the limbs at differant stages of being bent. With this type stringer, a bow of practically any draw weight can be braced by one person. Unless you are building 100# bows, this type is probably overkill.
With the addition of an extra set of string groover towards the end of each tip, a simple cord with a loop in each end will work as a stringer. Pat