Canada's Ross Rifle wasn't exempt from issues with poorly tempered steel. Replacement bolts arriving from Canada in 1915 were found to have "soft bolt heads" which Lt. Col. Harkom, technical advisor to Canada's Standing Small Arms Committee was ordered to "get busy and repair them". He developed the crude Harkom Method as a field expedient in which the bolt heads were re-tempered by heating them with a blowtorch hoping to reach 1,200 F. then "pepper" them with Ferrocyanide of Potassium. With virtually no quality controls in place the re-tempering was haphazard and it was a miracle that any of the bolt heads stood up under service conditions.