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I did my 102 a little different. I had one that the ball on the end had been ground off somehow and was like 101" instead of a 102" So I took a 2 foot section of 3/4" copper pipe and 2 copper caps along with 1  1" bolt to fit into my ball mount and 2 nuts to fit the antenna threads then began construction. I drilled both caps just the right size to fit the bolt through one and the antenna stud through the other. Then I put a nut on the antenna with it through the cap and heated it with a propane torch and soldered the inside of the nut into the cap with the antenna tightened with the nut. Then did the same to the other cap using the bolt through it with the bolt head inside the cap and a nut on the outside tightened and filled cap with solder. Then soldered both caps to the copper pipe one on each end to create a 2 foot extension made of copper at the base of the now too long antenna. I spray painted the tube black and put it in my ball mount and began tuning with a pair of 36" handled bolt cutters and trrimmed the top of the 102" until I achieved a SWR of 1.1 on both ends of the 40 channel band. It actually tuned like 1.5 from 40 under to 40 over the normal 40. I still have the antenna at work but the Chevy S-10 Blazer it was mounted to is gone.{Cry_river} The looks I got with that mounted to the roof on a ball mount where priceless. But God did it talk great. I will be making a new one for my next setup as it was the best mobil I've ever used.