"At the last test it was my seat, but it was not fitting properly. The guys made something with the seat that was quite uncomfortable and I had a lot of pain in the back and shoulders. Petrov told Autosport about his comfort levels.
"Here it is not perfect, but it's better. My new seat gets delivered on March 3 [Saturday], so I can use it on Sunday when I drive.
"It affects your concentration because you start to brake and you get something pinching you, and then you're in the corner. Of course you lose concentration. Things will be much better on Sunday."
The Russian, who was initially scheduled to drive on the final two days of the test, was only informed two hours before testing got underway that he would be substituted Kovalainen.
"I got a call at 6:40am. It's strange because usually I turn off my ring tone at night, but I forgot, so the call came through," he added. "The first time I didn't take it, but when I saw who it was I realised it could be important. It wasn't a problem. I always get to the track for the 8am briefing, so I would have been up by 7am. He'll be back in the car on the second day though."
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