I installed 8 Larry lugs on a cat(don't deserve a CAP ,ron) 287 track which the drive lugs had broke off on and it worked out so far , it wasn't hard to do and didn't even take an hour to do and cost about $300 with the templet and death grinder to do 8 , it is very messy , a little dangerous and probally unhealthy , the grinding wheel that they sell is a toothed 4 inch grinding wheel which is very aggressive , you have to grind the area where the new lug will sit flat without grinding into the Kevlar threads while the track is on the machine , you are working upside down and it's right in your face , the wheel will bite in and throw the grinder if you hit it too hard , it's about impossible to do a good job without having the exhaust throwing towards you at one point or another , the drill gauge , drilling and bolting up was a snap -------my thoughts on unhealthy is from Kevlar dust cause I am sure I hit the cores a few times , I had on a mask but the dust was every where , in my hair , ears , clothes and every where else , any body know where Kevlar ranks on the cancer chart --------I think if the speed of the grinder were turned down it would be easier to controll the grinder , I have one of them Heavy duty rostat thingees and will try turning it down next time , may also use the Blair grinder to knock down the bulk and clean up with a tire buffer wheel on an air grinder with a vavle on the air inlet