Paul Hembery believes the changes Pirelli have wrought this weekend will make for a "safe" German Grand Prix.
Pirelli came in for some serious criticism in the wake of the British GP, which saw several drivers suffer tyre failures. Such was the concern that drivers threatened to boycott this weekend's race unless changes were made, which have been.
Pirelli have not only introduced the Kevlar-belted tyres that the drivers tested in Canada, producing "1000 something like that" tyres in 48 hours, but they have also banned tyre swapping and set new pressure and camber limits.
And it's the tyre swapping that Hembery reckons was the biggest issue at Silverstone.
"We underestimated the impact of swapping the tyres," he said.
"When you swap them around, that creates a point with the metallic belt on the camber side and that creates a weakness.
"We got that wrong and we needed to get it right going forward."
The Pirelli motorsport director insisted that it now safe for the drivers to race, saying "we wouldn't be racing if we didn't feel it was safe."
Safe or not, though, the tyres will undergo more testing in come weeks with tests scheduled for Paul Ricard and Barcelona.
The tests, though, won't be run by any of the teams such as the controversial Mercedes outing. Rather Pirelli will use their "2010 car although it's obviously a bit slow."
Meanwhile, World Champion Sebastian Vettel is pleased with how things went on Friday.
"It was not a threat," Vettel said of the statement issued by the GPDA. "We expressed that we trust Pirelli.
"It was a good day today, but we also expressed if there were incidents then we would think about something. The tyres are fine, despite high tyre wear - particularly on the softs."