I have been trying (unsuccesfully) to find some good information on collet adapters. I have access to some free 1/8" solid carbide spiral cut bits and would like to try and use one in my router. My router is a 1/2" router (Hitachi M12v) which comes with a 1/4" adapter. I have searched and found some 1/4" to 1/8" adapters but no 1/2" to 1/8" adapters. I suppose I could put the 1/2-1/4 and 1/4-1/8 adapter in at the same time to transition down in two stages but that just doesn't seem like the best solution. My gut tells me that I might end up with some runout issues as well as possible safety problems. Does anyone have any thoughts?