Supplier for Hardware to install interior signs from grid ceiling tiles?

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I used to have a catalog some time back that sold all types of hardware for installing interior signs, particularly they carried plastic pieces that slid on the grids of ceiling tile to hang signs from ceilings, does anyone have a company they could recommend?
I am also looking for suggestions for stretching a banner neatly across a curved block wall. Thanks in advance for any suggestions!

 

[Rick]

http://hangups.com

 

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Thanks!

Perfect! I appreciate it!