Omori Omori...... hmmmmmmmmm I have been there!
It took us ages to find the factory, not knowing that it was actually on the omori subway line and not the JR omori line, then finally found it and majority of it was closed for refurbishment.
However the dudes there, were very friendly and despite not knowing how to speak English found an English worker there and yea very friendly.
This is the workshop:
Main door, see the left side it was all covered and being refurbished?