First, what model logitech wheel are you using? I havent seen one with clamp fasteners - only suction cups.
The G25 is top of the line.
It's an 11" leather wrapped, metal wheel, with 900 degree steering, metal pedals, and a 6-speed gate shifter.
The force feedback and amount of wheel travel are adjustable in the control panel.
I keep mine set to 360 degrees, which gives the wheel 180 degrees in each direction before you hit any major resistance.
You can also use the control panel to set the wheel to self-center with an adjustable amount of "spring" tension.
The Driving Force Pro is the next step down.
It still has the 900 degree steering, but only has an up/down shifter, and has plastic pedals with only a gas/brake setup.
It's still worlds above the other guy's offerings, and is much more affordable than the G25.
The Driving Force EX is the next step down.
This is where they start feeling really cheap.
It has about 200 degree steering, and the force feedback is really cheesy compared to the other two.
The nice thing about these is that they are compatible with with older Playstation games because they have a PS1 connector on them.
All three of these have clamps, but the ones on the G25 twist tight, and then push into the body of the wheel, so they are less visible.
Another push on them pops them back up, so that you can twist them off when necessary.
The carpet grippers on the G25/Driving Force Pro are really nice.
The ones on the Driving Force EX are not as good.