I have an annoying rattle. I don't know what to call this part. It's the metal part, with the little wheel, where the latch keeps th top from flying open!

Anyway the sliver part with the wheel is loose. I can't see a way to get it tight again? It rattles on every bump in the road!!

 

Do you mean the top latch? If so here's how to adjust it:

Document ID# 656616
2002 Chevrolet Corvette
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Folding Top Latch Adjustment



1. Adjust the latch handle (1) for proper fit, by raising or lowering the striker (3).
Important
You should not have to loosen the striker screws.
2. Use a nylon mallet and a drift to punch the striker (3). Punch upward to loosen the striker or punch downward to tighten the striker.
Notice
Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
3. Inspect the striker screws for proper torque.
Tighten
Tighten the striker screws 10 N•m (89 lb in).



4. Loosen the latch handle bolts.
Important
Assure that the latch handle base is parallel to the striker.
5. Reposition the latch handle forward or rearward. To avoid squeaks and rattles maintain a minimum of 2 mm (0.08 in) clearance between latch handle and the latch striker.
6. Tighten the latch handle bolts.
Tighten
Tighten the bolts to 13 N•m (10 lb ft).