Buy a piece of 1/8" brass rod; cut it to the length you need, thread one end with a #4-32 die. Now it will screw into the end of the dial indicator after you remove the tip that it came with.
Thanks so much for the good post and taking the time to pass on the link!Im just wondering how to find the right length, If the adaptor or extension there mentioning above are to long then would'nt this throw the reading?