Lock tight

[Mark the instructor]

Hi guys, I put a tiny dab of lock tight on my servo screws as they kept working there way loose then the horn would come off !!! Only trouble is they are bloody solid in there and when I went to undo one it's loosing the head of the screw !!!
What the hell am I gona do ???

[gray.g]

When you say a tiny blob....!?
One persons 'blob' can be completely different from whats actually needed. Loctite can be great when used correctly. I use spring washers under my servo screws to hold them in place.
If the head of the screw is fracked you could try dremmeling a slot across it and use a good flat bladed driver.
You could try heat on the screw to see if it loosens the loctite's grip. Hold a soldering iron's tip on the screw until it heats it sufficiently.
You could use a small punch to deliver a blow to the head of the screw to see if that will loosen it.
Ive recommended these extractor tools a few times. I used them twice last week when i did a full tear down on my buggy and they worked perfectly both times.
CLICKY for a god send!

[s3nutt]

What I do with servo screws is coat the screw in 'blue' lock tight,wipe the surplus away with my finger, place the screw in a driver then heat the screw with a hot air gun (hair dryer would have same effect) the lock tight dries hard between the threads, when you screw the screw in its a nice snug fit, job done.
Same can be done on wheel hexes if you are using non serrated nuts etc.

[garph]

Ouch.

A little bit of heat if you can but I don't think that will shift it.

I use a cleaning spray, TF90 (clutch and brake cleaner), at work that I've used to unstick Loctite but that was on much larger bolts and I didn't have to worry about the a delicate servo.

Can you take the servo apart to give you a better chance of not damaging things?

The blue flavour Loctite 243 is too strong for the M3/M4 dome head screws; you'll just round them off. I've gone for the much friendlier purple flavour Loctite 222 on my M3 dome heads which is much better suited to the smaller size.

[andy110m]

Can you remember what colour the threadlock was?

If it was pinky or blue you might be ok, if it was red you've had it.

As Garph mentioned 222 is great, I use the new sticks because you can't spill them. (see 248 following the link)

We only need a vibration proof threadlock, anything more just holds to tight. See the link for the differing strengths

http://www.loctite.co.uk/cps/rde/xch...on%3Dsearch%7C

[Chris]

I prefer to use Loctite 248, as it comes in a pritstick style dispenser, so less chance of getting it everywhere as it stays in one place, unlike the liquids which run all over the place:
http://www.halfords.com/webapp/wcs/s...egoryId_255230

[Mark the instructor]

I haven't tried anything yet as I'm afraid I'm going to knacker the servo it's blue lock tight I used ! The thing is its all good at the moment but I'm just worried that if I snap a servo horn that's it it's game over !! I'm going to try the soldering iron trick on it tomorrow so fingers crossed
That's for all your help so far chaps

[navrozeb]

Why not try a locking screw horn? I know Ansmann and other do them, where there are 1/2 smaller screws built into the side of the horn which prevent the horn coming off by clamping it down. No need for Loctite then, gave up using it as it was doing more harm than good. Clutch bell screw is the same problem but worse to get out in some cases, so just use mole grips to hold the flywheel and then you can nip the screw up really tight, again, no need for Loctite.

http://www.modelsport.co.uk/ansmann-...roducts/365648

[FatBoyObese]

I have suffered with my servo screws coming loose during the race and I used to loctite them.....however, I now use shakeproof washers, otherwise known as star washers and have had no issues since......you have to hunt around for them but they are available, not sure from where as I nicked mine off my old chap as he has loads of them being an engineer lol

[MrJonny]

I had my steering servo horn come off today in my final and it cost me a 2nd place finish. I'll be fitting with a spring washer this time.

Most annoying thing is, it's never happened to me before. I read this thread last night and it crossed my mind that now I'd read it it's bound to happen! lol