If I understand your question correctly you'll looking for how to keep the LED still inside the hilt (body) of the saber. The design is for the blade to hold the LED still, so if you have removed the blade you have two options. Engineer a blade plug (more work) or take the retention screw and screw it in until is just slightly enters the emitter of the hilt. This will keep the LED from popping out of the hilt.
If I missed your questions, please rephrase it and I'll give it another go.
Cheers.
Hey that's a good idea but how will i be able to engineer a blade plug because i am TOTALLY new at all of this and not very handy with electronics and building stuff.
Thanks for the answer and sorry it wasn't clear!