General Cycling Discussion - Mounting Fenders

I just got a set of SKS Commuter fenders for my Redline Conquest Pro. Front is mounted and in good shape. The rear however is giving me a bit of headache because there is not chainstay bridge on my bike and therefore the fender can only mount in two places. The end of the fender near my fd is not mounted to anything and makes noise going over bumps and rubs on the tire.
Anyone ever drill into their frame to mount a fender? I've got a nice long screw that came with the set and I was thinking of using a cork from a wine bottle to secure that end of the fender. If you could please post pictures or links showing how to properly do this. Thanks

edit: sorry, its a Redline Conquest Tour, not Pro. I would not be drilling into the Pro frame.

You might be able to get away with drilling the frame (I could, but all my bikes are steel), but I wouldn't make that my first choice. A few possible solutions that may work, depending on your exact situation:
--get a hose clamp big enough to go around the seat tube, put the bolt through the strap part of the clamp and tighten it with the head against the tube. Fasten the fender to that with a nut on each side to hold it secure. Cut the bolt off to fit. Put a wrap of tape under the clamp so you don't scratch the frame. You may have to drill the fender, but that's nothing.
--zip ties can work miracles. How about zipping each corner of the front of the fender to a chainstay, or to whatever else you can attach back there?
--alternatively, you could cut an inch or two or six off the front part of the fender, drill a hole in the new end and zip that somewhere higher on the seat tube.
Mounting fenders sometimes isn't an exact science. Improvise. If all else fails, walk through the small hardware section of Home Depot and look in the little drawers. You'll find something that will inspire you.

Put 2 holes near the centrline towards bottom front of the fender, then thread a zip tie through these holes and around the seat tube.

Nice guys, thanks. I didn't think of hose clamps or zip ties. I'll let you know how it goes.

yes...zip ties can work wonders. Less paint damage than hose clamps and strong as you'll need them to be. Just keep an extra couple zip-ties in your bag for emergencies. Go to the wiring section of Home Depot or an electrical supply store and you'll find a very wide variety of zip ties in various lengths and sizes.

Here's a pic of my Cannondale F2000 with Blackburn rack attached via zip-ties and some sort of mounting bracket that I picked up.

I also attached fenders to the front fork of an older Cannondale road bike by drilling 4 holes in the fenders and wrapping a zip tie around the upper part of each fork blade right below the headset.

P-clamps and a short strip of metal can create a chainstay bridge, I'll bet.

Either that or find a framebuilder to fabricate/add a bridge. That's something I'd never try myself.

I used zip ties to attach my front fender on my Kona. Zip ties can solve a number of problems.

With zip-ties it really helps if the material you are attaching is non-metallic, has a bit of elasticity or give and is shaped to fit. You could fashion a block of plastic to sit snugly against the rear of your seat-tube with a hole for a bolt and a recess for a nut. Add two slots or dimple to engage two zip ties and it should all be secure and quiet. You might be able to adapt a rear LED blinkie mount.