Spacers are designed to be lost.Not very environmentalty friendly that....never leave a spacer behind,if you you ask yourself... what is that spacer doing?stopping you from getting nice clean flush grouting line,costing me money replacing it,clutterinmg up my tool box,clagging up me hoover,trapping in my boots just because it's shaped like an X dosn't mean to say that you have to find an X space to put it in!!!!!!!!!!rest it on top of two tiles and re-use it plz,if sat on top then it cant be lost below THINK ONCE,THINK TWICE THINK SPACER