Thanks to primetime I picked up a Superion appendage kit, which motivated me to try fix Silverbolt's knee problem.
Some of you may not know that Silverbolt's legs are on backwards so that although he has knees he cannot bend them - and if he could they would bend forward, rather than backward.
I found this guide which was of immense help. It took me about 25 rather than 15 minutes but the result is worthwhile.
If you try it a word of warning - the springs in his hip joints can fire off. I recommend you keep a thumb over the springs when prising the joint off otherwise you will end up like me, on your hands and knees looking for a 5mm spring.

Apologies if it has already been posted

Linky link:

http://www.seibertron.com/transforme...minutes/16066/