You can download the exploded view of the C5 here:
http://www.rbproducts.com/explose/RB...PT/01005-C.pdf
This might be useful if you need replacement parts in the future. The factory needle settings are stated there, too.
There are also a bunch of good tips on the RB website:
http://www.rbproducts.com/mainEn.php?part=Support
Have fun,
Andreas