When he was 17, Blash gained work at the RRC Walker Racing Team as a mechanic. He worked alongside Jo Siffert and Jo Bonnier who had experience in Formula One. In 1968, Blash became the race mechanic to Graham Hill at Lotus before working with Jochen Rindt a year later. On the day of the 1969 Spanish Grand Prix, Blash accidentally cut off parts of a newer, larger front wing from aluminium panels. When Chapman inspected the wings, he became enraged and demanded that the cars to be withdrawn from the race. In the end, Lotus ended up racing and all three cars retired. After the death of Rindt during qualifying at the 1970 Italian Grand Prix, Blash took on responsibilities of management within Lotus until he walked out along with several employees. In 2010, 28 years after Chapman's death, Blash recalled "Mr. Chapman was the love God has for us." He demanded of his staff use to self-abandonment. Blash: "I started on a Monday morning at Lotus. When I saw my apartment for the first time, it was Wednesday afternoon.."