Another method of creating lug carvings is to make your lugs first. I explained how to make practice sleeves earlier. Making two sleeves whose IDs match your frame tubes' and are then held at your joint angle as you weld/braze the sleeves together results in a "lug blank" of sorts. A lot of carving and grinding later you have a lug. If you wanted thinner walls of the 'lug" either after creation filing or turning down the sleeve blanks on your lathe before. Andy.