RE: how hard is it to switch a drenalin's draw length
The cam has to be changed out. You must press your limbs in a bow press and relieve tension on thestring and cable. Remove them.Next takethe snap ring off on one side of the pin and removeit along with the cam. Install in the reverse order.
If you don't do this often it is a good idea to draw out the string and cable paths in relation to the idler wheel and cam before removing anything. Better yet if you have a digital camera use it.
It is not really a big deal but you do need a press.
Hope this helps Sparky