Two things:

My century PG2000IIR gyro is not working. I still have tail control with the servo, the light is on but it doesn't respond to movement. Nothing has changed other than lost teeth on the main gear on my nexus which caused the tail do some serious dancing. This has been fixed and now the gyro is not working. Changing the gain has no effect, am I missing something?

Secondly, those plastic screwdrivers for adjusting the gyro's....why not metal? Is this to prevent over "tightening" or is this an electrical issue?
Would using a metal screwdriver cause the above to happen?

I'm going to install a GY401 and don't want a repeat with this gyro!

Anything that creates an oscillating electromagnetic field (especially if low signal levels are involved), can be influenced by a chunk of iron or steel nearby. You really see this effect in the receiver section of a radio. This is why "tuning wands" exist. These are basically plastic screwdrivers for adjusting sensitive circuits.

They give you a plastic one because it's cheap... you can use a metal jeweler's screwdriver if that's handy. If you're not careful, I'm sure you can turn the little trim pot past it's endpoints with a plastic or metal screwdriver!

They're plastic, as -pkh- said, because it's cheap to make and also so it can be snapped onto your TX's handle so it's always handy. I lost mine a while ago and use a small jewelers screwdriver to adjust it.

Regards,

Mike

So that's where you're supposed to snap it onto! I knew it was made to snap onto something, but didn't know what it would fit onto!

The hele should be turned off anyway when ajustment is made so no electrical static etc would effect it.
Also gyros only use the new settings of the pots after they restart. i think 8)

Mine doesn't (GY240). I never shut it off before I adjust it.

Plastic screwdrivers for adjusting gyros and speed controls do not exist because of cost.

They are to prevent the servos from twitching from interference when the two metals meet. I personally would not want my throttle servo dancing around when I'm trying to adjust the gyro. I have also seen recommendations to use plastic when adjustting your low speed carb needle too.

Umm... exactly what "interference" would this be???

A plastic screwdriver would strip out before it even budged my low speed needle!

Exactly. Try adjusting the idle mix on the OS 50 with a plastic screwdriver. It's hard to turn with a metal screwdriver. And what 2 metals (re gyro adjustment) are we talking about? The adjustment pots on your gyro aren't metal.