I'll second SawTroll. Earlier in this thread you'll see he tried the 14mm then a 16 mm; I don't recall that he noted a performance difference, but he left it at 16.
I just finished mine today!
Thanks Andy; no matter where you're hiding these days! 
Using the 16mm screen/clamp part numbers in this thread [it seems somebody here has it in their sig line too], you can get a pretty nice fit with a 5/8 X 1/2 spacer tube [roughly .050 wall - the math would be 16th but they leave about 64th each way for clearance]. I do like the look of the 16mm; the Ace Hardware tubes had an ID taper at the ends so a little grinding on the OD to make the end a full half round - the screen went down flush without even a hammer.
The brazing litterally was minutes. I had to put my own twist on it, so I brazed it before drilling and used the tube as a drill guide rather than dremeling a round hole oval. Doubt I saved any time [with an endmill instead of drill though!] over the dremmel oval as grabby as drill bits are, but it was fun to try!
The one part that got me scratching my head, was that I had it in my head I could pull the limitters without removing the screw cowling [and now somebody is going to tell me it can be done], but gave up, removed the intake and the cowling [at this point wishing I'd blown off the saw better] a drywall screw turned a little further after it it hit the lean end, back to rich, and it came right out. I ground off the tab and replaced it, but now wonder if I could have just turned it 180 richer?
I just finished mine today!
Thanks Andy; no matter where you're hiding these days! Using the 16mm screen/clamp part numbers in this thread [it seems somebody here has it in their sig line too], you can get a pretty nice fit with a 5/8 X 1/2 spacer tube [roughly .050 wall - the math would be 16th but they leave about 64th each way for clearance]. I do like the look of the 16mm; the Ace Hardware tubes had an ID taper at the ends so a little grinding on the OD to make the end a full half round - the screen went down flush without even a hammer.
The brazing litterally was minutes. I had to put my own twist on it, so I brazed it before drilling and used the tube as a drill guide rather than dremeling a round hole oval. Doubt I saved any time [with an endmill instead of drill though!] over the dremmel oval as grabby as drill bits are, but it was fun to try!
The one part that got me scratching my head, was that I had it in my head I could pull the limitters without removing the screw cowling [and now somebody is going to tell me it can be done], but gave up, removed the intake and the cowling [at this point wishing I'd blown off the saw better] a drywall screw turned a little further after it it hit the lean end, back to rich, and it came right out. I ground off the tab and replaced it, but now wonder if I could have just turned it 180 richer?
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