So yesterday I borrowed a buddy of mine's Work Sharp. He had never used it. I read the instructions and watched several Youtube videos. All my pocket knives are 8-10 yrs old and never sharpened before. I tried the Work Sharp on a cheap old pocket knife first. For some reason with the first belt I can not get a bur to develop on the blade? I made 15-20 passes on one side. Can anyone give me tips on what I'm doing wrong. I did go through the entire process and while the knife is sharper. I can not get shave the hair off my arm sharp.