"we're not allowed to change (fit) them" etc., etc. And even (yes, you've guessed it) that it would be construed as "modifying the kit" (words fail me)!
If the fuse blows do they go to the OEM and get a "genuine part" or get one from the drawer?
I do not kow what is wrong with "modifying" equipment. You are only doing wrong under CE regulations if you try to sell it outside of your organisation.
RoJo
