Sentence:  If weight carriers are not available use a strong <WSD>bulldog clip</WSD> with a pot attached to it by thread going through the hole. Clip this to the sheet of paper and gradually add weights to the pot. The <WSD>bulldog clip</WSD> sometimes slips off the paper, so wrap the end of the paper around a pencil and the <WSD>bulldog clip</WSD> will grip this. 
Meaning of the word marked with <WSD> tags:  A binder clip with rigid handles.