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Are the 5700 and 5800 jockey wheels the same? I know one is 10 speed and one 11 speed but are the jockey wheels the same size so I can put some 5700 in my 5800 mech?
Thanks.
Edit - have some rd5700 but they look a lot fatter hence checking before I pull the mech apart!
I don't have experience of this swap, but I use Ultegra jockey wheels in a 105 mech. The 105 pulley-bolt is shorter than the Ultegra part and locks the the jockey wheels solid if you tighten it.
The 5700/5800 jockey wheels have different part numbers:
[url= http://si.shimano.com/php/download.php?file=pdf/ev/EV-RD-5800-3712B.pdf ]5800 part numbers[/url]
[url= http://si.shimano.com/php/download.php?file=pdf/ev/EV-RD-5700-3042A.pdf ]5700 part numbers[/url]
From your description of "fatter-looking", I would expect a similar problem. I used 6Nm threadlock on a loose bolt which worked for me, but if it doesn't work you're in for a walk home, or worse. Buy matching pulley bolts or the correct wheels