Please forgive my super noob vocabulary. I'm not sure how much of what I'm saying is obvious, or too vague. My bicycle is a Japanese 2009 Bianchi Pista, with all of the original parts, which you can see here:
09 PISTA DROP BAR
I just flipped my hub from fixed to freewheel for the first time. Well, my LBS flipped it into the freewheel, showed me how to do it, and then later at home I flipped it back. It seems so simple when I watch him do it, but now I'm nervous cycling for any distance.
Look, here's what I'm nervous about. This... black thing (vocabulary???? Sorry) isn't actually hooked tight onto the frame. I didn't tighten it all the way on. The way the LBS showed to put the pieces back together was:
First, you tighten the the 10mm nut on the back, on the RIGHT side, to get the tension right on the chain.
Then, you tighten the same thing on the left side, to center the wheel.
Then, you screw the bolts onto the side tight with the 15mm wrench.
This is good I think! The bolts on the side are really solid! I don't think he explicitly told me to really crank the small ones on, though. But these loose black parts on the back make me so nervous! Of course it's not the actual black piece that I screwed on, it's the tiny 10mm nut, and boy I don't want it to fall off!
Are they okay? Can I tighten them all the way? Did I put them on improperly? Or am I totally off base? THANK YOU, and please tell me where I can be more specific. Also, sorry for the grainy phone camera pictures!
Oh, and one last question: do you see anything wrong with my wrench? Do you recommend I carry around bigger wrenches than this? These things seemed to work fine, on this one and only time I changed a wheel.