If you like the Haiku pattern grip mod you might also like this variation, the Knurly Haiku pattern:
Please look closely at the image above. There is a distinct variation in the knurling pattern from band to band. Before knurling this light a number of sample parts were machined & I thought it would be possible to have each band identical to the next. Try as I might this did not happen. On the positive side no two lights will look exactly identical
Since the grooves were already cut the tool rolled over the edges slightly. This gives the pattern a nice smooth feel. If crisper edges are desired the knurling can be applied before the grooves are cut.