The small bendable block is called a stand-up single block. There pretty common, especially for jib sheets, and should be available in most chandleries if your looking to replace one. All the big-guns make them...Harken, Schaefer, Ronstan, Lewmar. They allow the sheet to pass through the block with some flexibility of entry. Incidentaly, the mast looks like a small tree trunk. Is this something you installed? Has it been successfull? Don