Rails - May 2008 - Attachment_Fu : how to remove thumbnails only and regenerate

hello guys

i am using attachment_fu for product images
i have hundreds of products and their images
with thumbnails :thumbnails => { :thumb => ''100x100>''
}

now we have decided to have thumbnails of size 50x50> only.

how do i destroy the existing thumbnails for images
and regenerate the new thumbnails

i shud be doing something like this

product_images.find(:all)
for each prod image
destroy the thumnnail. ---what method
create new thumbnail from existing images for products  ---what method
end

pls help

jags
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