You should be able to work it out from the pics.
One difference between this one and others I have seen are that this one includes a stop (marked 1 and A in the above pics) that rides inside and on the bottom of the bar groove. If the groove is closed down too far you can feel significant resistance from this stop so thats where you stop closing.
It works great and scrunched an 0.050" bar groove that had opened up as much as 0.008" back to where it should be in very short order.
One difference between this one and others I have seen are that this one includes a stop (marked 1 and A in the above pics) that rides inside and on the bottom of the bar groove. If the groove is closed down too far you can feel significant resistance from this stop so thats where you stop closing.
It works great and scrunched an 0.050" bar groove that had opened up as much as 0.008" back to where it should be in very short order.