Man... It seems I confuse this...
But it may as well be a head for reading the tape...
It been a very long time since I last opened a VCR to get parts...
And it MUST be an eraser... but why not a reading head...
How old was the VCR... the new ones have multiple heads to read the tapes starting from 2 to 4 , I don't know if more exist...
Anyways... must be an eraser... so don't bother much my reply...
Lefteris