Ok Crowhawk, I think I found one, looks like it has the old style wheels, if that's the case there will be slots in one side of both wheels, the shooting string will be fed through one on each cam, by moving the string to the furthest one (wrapping more string around the wheel in effect) you will shorten your draw length. There will be about four slots on each cam and each one will change the draw by about an inch.......you need to make sure that the string sits in the same groove on both cams, for instance the second one in from the limbs face on both, so that your cams stay timed.
You will definately need a bowpress for this, and wind the poundage off the limbs before putting it in the bow press so as not to over stress the limbs.
If you need to put new cables on, you might need to take it to an archery shop as I think your cables will lliterally be cables (steel with a plastic cover) So you can have these replaced with string material, as on more recent compounds, or you might be able to have the cables adjusted somehow.
If in any doubt get a bow shop to look at it for you, better to be safe than sorry, especially when you're playing with 70lbs
