Scooterotica

screwfix, £4.99.
http://www.screwfix.com/p/erbauer-impac ... eces/6297d

Nothing to stop you using them for nut running other stuff.
You can set the torque limiter so you do less stripping.

This is what I use.

Snap-on stud extractor, has two insterts. 6mm and 8mm (other sizes available also)

The 4 studs shown would not budge with the double nut method and heat. This tool grabs and aligns with the threads. It will even fix lightly rolled threads in the process. Used by diesel mechanics so I don't think I will ever wear it out. Cost about $200 but totally worth it.

that's the cam type i"ve got, (double concentric sounds a bit puffy)

Unless your doing 100, s a day isitworth iti just did my side case took about 20 mins did it while the mag flang was getting warmed up for new bearing I find with double nutting you get a "FEEL" when your putting studs in ive never stripped or snapped a stud when just using my hand tools

I find the best way of fitting studs is to use a long nut on the end of the stud thread with a bolt going into that, you then just tighten the bolt until it comes to a stop, the second you undo the bolt it comes straight out of the long nut and that too unscrews easily. Too often just tightening the double nuts chews up the nuts or worst, if you use stainless nuts, it can chew up the stud thread. Obviously this only works fitting them.

corrado wrote:I find the best way of fitting studs is to use a long nut on the end of the stud thread with a bolt going into that, you then just tighten the bolt until it comes to a stop, the second you undo the bolt it comes straight out of the long nut and that too unscrews easily. Too often just tightening the double nuts chews up the nuts or worst, if you use stainless nuts, it can chew up the stud thread. Obviously this only works fitting them.

that was my preferred method for many years until I couldn't get those 4 cylinder studs out. No matter what I did, they were not coming loose. Even with the snap-on tool I had to get it super tight before it would grip them enough to back them out. Still have a modified 6mm long nut (tapped to 7mm) that I use for end plate studs.

corrado wrote:I find the best way of fitting studs is to use a long nut on the end of the stud thread with a bolt going into that, you then just tighten the bolt until it comes to a stop, the second you undo the bolt it comes straight out of the long nut and that too unscrews easily. Too often just tightening the double nuts chews up the nuts or worst, if you use stainless nuts, it can chew up the stud thread. Obviously this only works fitting them.

That's the method I use, I make the long nuts from a bit of good quality hexagon steel with the relevant stud size thread, it can be used for stud removal if you use 2 spanners to keep the bolt tight on the top of the stud.