Having just read Yes Cymru's Independence In Your Pocket booklet, I went for a stanley knife. I went into the garden for safety and cut it in half.
Straight down the spine the knife went. This left me with one copy in Welsh and another copy in English!
I stuck a new card cover on the back of each, GK Chesterton Prayer (in Welsh) on the inside and GKC Taffy quote on the outside.
Will now send them to a couple of bods in Wales. Job done 😎
(You can buy copies from Y Lolfa)