I have fought tip burnback till I went crazy. I have aMillermatic 211 Autoset and love the machine. It does beautiful work on allkinds of general steel with the standard steel wired gun. A

Aluminum is anotherstory though. 1st, it will not run 5356 fill wire on anything. Itdoes grudgingly I guess, just looks horrible with smoke, spatter and bead pileup and poor penetration. 5356 is NOT the wire for this machine. I get that now.

The machine does run 4043 for Aluminum and does well except for the 'EVERY 5MINUTE BOUT WITH TIP BURNBACK,
CLOGGED WIRE IN THESPOOLGUN, 1/2 HOUR DISSASEMBLE, NEEDLENOSE PLIAR FIGHT TO DIG OUTTHE BALLED UP WIRE FROM THE DRIVE ROLLS ETC. ETC NIGHTMARE, FOUL LANGUAGE SHOUTED ATWIFE AND DOG, NEITHER OF WHICH WELDS.

Started searching the internet for like victims of the "Gonna Give me aHeart Attack Spoolmate 100 Tip BurnBURINGEST SOB on the planet"Viola=====hundreds of other Spoolmate owners/victims all of which areexperiencing the dreaded "EVERY 5 MINUTE TIP BURNBACK EPISODE".

Solution in short. Take your currently "Worthless Spoolmate 100 gun withthe little costly 186406 tips and throw all those little expensive $%*#$%saway. Never use them again, they cannottake the heat of the arc and will always burn back. I kinda think this was done intentionally by themanufacturer to make us all buy the grossly more expensive spool guns. You must drill out your copper/brass tipreceiver barrel to 1/4X28 threads to accept the larger commercial grade tipseg: 000068X0.35. Drill in approx ˝ inchand tap the new oversize 1/4X28 threads into the barrel. You must also cut the spring wire alignerinside the barrel off about ˝ inch too. Screw in your new Heavy Duty tip and enjoy “BURNBACKFREE, ROW OF DIMES LOOKING, SMOKE FREE, SPATTER FREE, DEEP PENETRATION,PROFESSIONAL LOOKING WELDS USING 4043 at a thickness of 0.35. Why didn’t they just put these tips on thegun in the first place and stop us all from contracting Spoolmate High Blood Pressure?