I've used this stuff at times

http://www3.towerhobbies.com/cgi-bin...OD++&search=Go

I use the screw connectors also. Just add a little solder to the cable , where the screw grips , then when you tighten the screws down , gives it something to bite into. your throttle arm on the carb , can be just about up against the firewall and still works great

Picture worth a 1000 words , so I try to get you some picks , while I`m out in the shop tomorrow .

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If Minnflyer's set up doesn't work, something is wrong with your throttle

The throttle must move freely full travel
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My throttle arm moves just fine, with no binding at all, but even static, if i push it to one end or the other it tends to want to roll back away from the stop just a little. The pushrod I have tried to use to this point, just doesn't have the holding power at the ends due to the 2 90 degree bends in it. Because of it's location and the narrowness of the fuse, I'm not able to reposition the exit from the firewall. I'm gonna have to try the cable style for more positive control I think.

There nothing positive about a cable when you are trying to push with it

I have used them and they worked great but the end had to be aligned with the engine and the servo. The cable guide has to be secured against movement

And I think that's where I'll have the most trouble because in my case (if I remember correctly) it pushes toward idle, and pulls toward WOT. I may be able to remove the throttle arm and re-install it 180 degrees from it's original position to get it more inline with the exit and make a guide in the engine compartment to minimize flex.

If you need the cable to be stiff in a certain area , wicking a little solder in the weak place stiffens the cable . and the cable pushes just fine, if you have it set up right. Dont cut the tube at the bulkhead , where it comes into the radio compartment . Cut it a 1/4 inch short of the sevo arms farthest forward throw. If it still flexes alittle , add a standoff, to support it. Heck , most the time I use a micro servo , they move that freely .
Most throttle arms have a set screw so you can rotate the arm. Most , if not all my installs have been with the arm up. . Just seemed to work out that way.
If your wire flexes to easliy, you may be using to soft of metal rod or if you have done a lot of bending on it , have taken the temper out of it. All the fixes mentioned should work for you, not sure what you`ve got going on, but dont give up.

I made sure my tubing was secured at several point along it's length, and the terminal ends are never more than an inch from being inside the tube. I've got almost 0 flex.

Here's two set up's the first is a Saito 72, the second is a Magnum 70