Good Morning Sprinkles. xx

Mondays riddle answer was - Boxing Ring..
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Yesterdays again in case you missed it.

My first is in cater, but not in skater.
My second is in tour, but not in sure.
My third is in small, but not in crawl.
My fourth is in tomb, but not in loom.
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Todays is:-

I have a head and I have a tail, but my eyes can never see my tail. What am I?

All answers on my back wall please xx