It is necessary to remove the back part of the LD module?

Hello fellow LPF members,

I have this burning question before I could continue my laser assembly:


http://imgur.com/a/9rVFg

Why do instructions and tutortials always say to remove the back end of the laser diode Module? Why can't it be attached to give additional heatsinking? I think that it should have enough space as the full LD module shown in the picture is shorter than the heatsink from SL and should not obstruct anything else?

Thanks for reading and replying :) :wave: