I am new to tying and have made several chenille type jigs and am getting the hang of it. I was going to make a jig and just use the thread for the body color. I am using collarless jigs and had trouble with two things. One is the thread getting built up thick enough. I am using 210 Denier flat waxed and it takes a seemingly lot of thread to build up the body to an adequate thickness. Also the thread wants to slip down the hook. The thicker I try to build the body the more the thread wants to slip down the hook shank. Can someone give me some clues as to how to overcome these problems? Thanks