How to put the abrasive disk on the HSA Power Trimmer Be certain the grinder is NOT plugged into the power supply. Use the supplied open-ended spanner and place it onto the grinder disk shaft to hold it in place so it doesn't move. Hold the spanner to prevent the shaft from moving. With the other hand, take the other tool, which is the locking nut removal tool and place the 2 metal pins into the 2 holes on the nut/flange. Turn the nut anti-clock-wise while holding the spanner still. You have position yourself to look at the nut/flange to know which way to turn the nut. Anti-clockwise loosens the nut/flange and clockwise tightens the nut. After loosening the nut/flange, you can continue to unscrew it with your fingers. Then you can take off the disk and replace it with a new disk. The new disk has to go on with the writing facing down so you can see the abrasive surface of the disk. Place the nut/flange onto the shaft and turn it clock-wise to tighten it. Make sure the high part of the nut/flange, the side with the protrouding lip, is facing you, not facing the grinder. Use the spanner and the locking nut removal tool together to tighten the disk. Do NOT over-tighten the disk or you will have difficulty removing the disk later and you might seriously damage the shaft locking mechanism. One disc should last for about 5-8 trims if you make sure that the hooves are clean before you start working on them. Of course, if the hooves are over-grown, it will wear the disk down faster than if the hooves are well maintained. IMPORTANT FOR SAFETY 1. Do not push down so hard on the grinder that you slow it down while trimming or you can burn the trimmer's motor out. 2. On a horse that is already comfortable and accepting of the grinder, it might be best to start using a new disk on the hind feet, (behind the horse, not with the hind leg brought forward under his/her belly) as loose particles might fly off the new disk and possibly startle or irritate the horse. When grinding the hind hooves, you can angle the grinder so that grit flies away from the horse's belly when starting to use a new disk. 3. Be sure to use the tail bungee to tie up the tail out of the way before doing the hind hooves. I have forgotten to do this once and thankfully the arabian horse didn't panic as the grinder got caught in his tail and was left hanging there. I was very thankful that the cut-off switch worked brilliantly too. So, please don't forget to get the tail securely tied up before using the grinder on the hind legs. 4. If you cannot get the disc tight enough by turning gently, it is probably because the locking nut/flange has been put on upside down. To fix it, remover the flange and replace it the other side up. If you have any problems or questions please call me, Sherlene on 0466 661 412 or 07 4157 9962