"He enjoyed hillwalking, photography and music. But he particularly enjoyed meeting and helping people. David could always be asked to help or would be the first to volunteer his services. David could do 'anything' and did it competently and well.
"David died tragically at the mill on March 18. His family and many friends are devastated at David's death and are finding it hard to come to terms with his untimely death on the day of his 49th birthday.
"David will be sadly missed by many."
Emergency services were called to the site at around 10.15am on Monday. Mr Leslie died at the scene.
Grampian Police and the Health and Safety Executive are investigating the accident. The force said a report will be sent to the procurator fiscal, as is normal in such circumstances.