can you change the draw length on a switchback without changing the cams

I don't think so.

No you can't

Change thelet off stopper thing and it will either shorten or lengthen it a half inch. If its on 65% though, its as short as it will go. Thats about all u can do.

If you need a longer draw though you can add to your d loop.

Now that's innovation

Isn't it though. I mean, that's where we were 30 years ago...except then you could change the string in about 15 seconds with the old tear drops. Seems like they're going backwards. Now that would bea trip. Considering their draw lengths and poundages have always been suspect and somewhat misleading and downright WRONG in the past. So you plunk out several hundred dollars for a bow and it doesn't fit. Duhhhhhhhhhhhhhh..... here's your sign Mathews.