You need to go back directly to the manufacturer and ask. Unless there is someone reading this forum and familiar with your equipment, it might be quite difficult to find as it is specialist. The manufacturer should have made the equipment to a particular standard and have the information 'to hand' so to speak. It should be quick and fairly painless. If the manufacturer went out of business some years ago (I don't know the equipment nor the manufacturer) I would suggest that the tools are probably old enough to be considered as 'over the vibration limit' and a new type sought. Hope this helps (although it probably doesn't!).