That's cool I am ex New Zealand Army and doing my first troop I have exactly that in my box, along with sticky white Velcro, extra elastic, spare power bank just in case and a few other bits like scissors, shoe horn, one of those white car touch up pens just in case!! and worse case scenario I have some magnets if all else fails to hold something together!! Doing a library troop so sounds like alot of fun.
So good to know I was on the right track before I found this page. Just made sense to me as that's the sort of stuff I used to carry to repair my kit while serving.