Hi Willowflat, thanks for more ideas and yes a break will be good and as you say more tinkering needed and I have lots of new things to try.
I find the Trapinator bite bar pretty easy to drill, I will attached pics using a broken trap waiting to be repaired. The bite bar has holes in already, I enlarge one with a 3.5mm drill bit, then insert an 8gx25mm (20mm better) s/s screw. Make sure they have the thread all the way to the top of the screw, technically a machine screw I think. Then attach bait. I find it doesn’t interfere if you want to use a soft bait like possum dough. Cheers