Anybody got any tips as how to remove a (very small) screw from the transponder of my remote, to enable me to change the battery. One screw came out perfectly, but the other has no grip on the crosshead - I think the garage who installed the last battery has completely 'mashed' it and now there's nothing to grip against to turn it. I have tried dripping a very small amount of WD40 in the area so as to make the screw less tight, but there literally is nothing I can get any purchase on to remove the screw. Any tips out there, please?