I have said this many times before, if you mess with the original parameters of a fuse so that it actualy has a measured diffrence as to the current over time it can carry, then its safety aspect as to the rating it originaly adered to is compromised, IMHO and from experience of repairing equipment where these things have been fitted, I strongly advise that you think very carefuly about the possible ramifications of doing so before you decide to fit them!