McLaren has made changes to its pit crew and processes, following recurring problems at recent grands prix.
Team boss Martin Whitmarsh launched a full internal investigation after Bahrain, where problems with the fitting of wheels during crucial stops resurfaced.
"We have to try and make sure we pick up on them (the problems) for the next race because we can’t afford to lose points like we did," said Lewis Hamilton.
One wheel-gun operator got the lion’s share of the blame, but Whitmarsh insisted that McLaren would also "look at the equipment, the process, the approach".
He told reporters on Wednesday: "We have looked at what we are doing and have made some changes to the team and the process and we’ll see them on Sunday in Barcelona."
Despite the heat felt by the deposed wheel-gun operator, Whitmarsh reveals he was "astounded" by the number of McLaren mechanics who put their hands up to replace him.
"It reflects well on the spirit of the team. There’s been a reasonable amount of practice and we’ll see at the weekend. I believe we’ll have good stops," he concluded.