I have always wanted a laser edge finder since I first set eyes on one, butthe cost was ridiculasS £79 my A***
So I decided to make one, It is all done with basic turning, center drilling, drilling and tapping so I wont bore you with pictures of the deatils
and depending on what laser you buy the dimensions will need to alter accordingly
anyway, so I bought a keyring laser pointer off Ebay

turned a length or Stainless roundbar down center drilled it and drilled it so it holds the laser snuggly turned it around and thinned the back down so as it fits in drill chuck or collet I also drilled a hole and threaded it m4 so a grub screw can hold the laser is situ

next I made a coller to slide over the laser housing with one grub screw to lock it on to the housing and another above the on/off switch

a step inside alows clearance of the switch and forms a shoulder for the laser housing to butt up against

the three main parts

the laser in its housing

The finished product

Now it can be placed in the milling head in either a drill chuck or collet holder a little turn of the grub screw an on it comes a little red spot directly below
BEWARE some of the cheaper laser keyrings lasers' are not quite central so you may have to bore a bigger hole in the housing and use some shim steel to move the laser over, or drill the hole off center in the first instance, the way I checked mine was to place a center drill in the drilling chuck and just barely tuched on to some scrap material, replace the centerdrill with the laser and see where red dot is in relation to the centerdrill mark, mine was spot on
so there you go in less than an hour you can have a £79 laser edge finder for less that £2 and a few bits of stainless steel off cuts, and 3 grubscrews
Regards
Andy