I recently acquired an old Darex M4 or M5 drill bit sharpener. I have read a lot of post on this forum about how well people seem to get along with them, so I thought I should be able to also. But I am having trouble and need some pointers. I am not sure how to use the sliding indexing gauge to index the bit. I have tried many different scenarios and yet to produce positive results. I am assuming my problem is with indexing the bit in the chuck. I am using the 135-degree settings. I think splitting the point would help but the edge of the right wheel is rounded. Am I correct in thinking that a sharp bit without a split point should drill, ok? The picture of the drill bit shows arrows pointing to hot spots where the bit just spins on the metal and heats. I would like to put new CBN wheels on but want to make it sharpen a bit properly first. The only manual I found online to reference shows a different bit indexing jig. To those who have the old machines and successfully use them please offer pointers?