Missed the +. You may be able to get bigger ones ? In saying that, with that particular type of cutter, although it is much safer for the fingers, the bigger the cut length the less accurate it tends to be so possibly not suitable for your application.
1 Like
I have seen them up to 720mm in size.
I know this is probably a daft reply, but when I was using a trimmer, if i trimmed the shorter sides first, the longer side would then just fit, but it depends on how much margin you are trimming 
Different scenario - itâs a panoramic photo so is the full A3+ width but with big white margins top and bottom. These I need to cut off and then it will be mounted on a long artistâs canvas (narrower than a standard frame) covered in black paper. Iâve done it before - it looks good. Just trying to save my thumb while doing it!
I think a safety metal ruler is a possibility, thanks @Corona, with a scalpel thanks @Mat_Davies @DrMarkH . Weâve also realised that if OH is holding down the far end of the ruler and I am cutting away from him then the ruler stays steady and doesnât skid. Iâve managed to do it, but want something safer, if possible, in future.
Thanks for all your suggestions.
I know gloves are cumbersome but I bought some non cut gloves for the framers at work not so long ago, accident book doesnt look so worn out now.
1 Like
I use a 4â long steel 1/4" thick metal straight-edge that I bought in Graphic Access in Boston (MASS not Lincs) in 1988 - their range of straight edges included 6â and 9â lengths! Must have used it over a thousand times for all sorts of jobs - itâs possibly my favourite tool.
The advantages of a straight-edge are that itâs heavier, thicker and wider than a normal steel ruler, so itâs easier to hold firmly.
A quick search found this, which would probably be ideal, even though itâs comparatively light
https://tinyurl.com/yta7vwp4
1 Like
Finger Guard rules would probably work for you but I havenât managed to find any in France âŚ
1 Like
Hello Sue,
This is a long shot⌠Iâve just finished my move to the upper end of the Vienne. If itâs not too far I have a mat cutter that you can borrow.
Ant
Thanks Ant. In fact youâre some way away - nice idea. With OH help I managed this time and the two cuts were nice and straight and thumb is intact. The photo in question will be hung tomorrow.
I have one like that and lots of replacement blades but for the life of me, I cannot take the blunted blade out to insert a new one. Any tips please.
Thanks.
Flex back of blade up, push blade away from the handle. A small pair of pliers will help hold the blade
Follow Billyâs instructions above, but you might find it helpful to lift the rear of the blade with a thin tipped screwdriver then slide it forward with the screwdriver tip or pull it with square tipped pliers.
If that doesnât work snap the side of the blade with the pliers then use them to pull it apart.
Thanks Billy and Dr Mark. I will give your instructions a go and see if I can do it. Iâve done it before but not for quite a while so it might be a bit set in there.
WD40? Clean well afterwards obviously. I use it for everything. I managed to release a point and shoot camera lens that wouldnât close properly with a tiny bit of WD on a cotton bud. No detriment to the camera or the quality of its photos.
Its amazing what a little squirt can do 
2 Likes
Thanks Sue. OH has some in his workshop so will give it a try if stuck. It is very useful stuff for freeing âold jointsâ.
Corona. Are you referring to anyone in particular?
Iâd be very interested in a link to the gloves you bought, if youâve got the time 
Thanks for the link, Vero. Iâll have a look at those
1 Like