Yeah, good that you caught that. Much better to tear down to replace a crappy tensioner than to replace the whole valve train. Don't forget the 6x2mm o-rings also, 2 around the oil jets and 2 under the outside ends of the cam towers. A couple guys on here have made the jets on a lathe. Do some searching and sweet talk 'em if you can't find replacements. Might have to be real sweet, as apparently, they are a pain to make.