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servo grommets

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og26/04/2017 13:19:51
61 forum posts
5 photos

there must be knack to getting the rubber grommets into the round holes that i dont know about


Mowerman26/04/2017 13:26:09
1565 forum posts
105 photos

Wet them (spit is ok) and squeeze.

Braddock, VC26/04/2017 13:29:13
1660 forum posts
82 photos
Posted by Mowerman on 26/04/2017 13:26:09:

Wet them (spit is ok) and squeeze.

Preferably before you put the brass spacers in.

Dave Hopkin26/04/2017 13:57:36
3672 forum posts
294 photos

Thread the sleeve and the grommet onto a screwdriver or bit of piano wire and push into the hole they line up and slip into place easily then

og26/04/2017 14:07:56
61 forum posts
5 photos


getting it now - a bit of spit & back end of scalpel blade

tigerman26/04/2017 14:53:09
241 forum posts
1 photos

I find the best way is to put the grommets on the screw you are going to use and just push them on using the screw

Don Fry26/04/2017 17:19:00
4557 forum posts
54 photos

I have for many years carefully been putting the brass ferrules in, using a Khama reinforcing use of a steady hand, a good eye, and faith. And a large stomach to seal the bench from the floor.

It is shattering to learn there are easier ways.

Former Member26/04/2017 17:48:26
1322 forum posts

[This posting has been removed]

Trevor26/04/2017 19:27:27
521 forum posts
61 photos

I fly gliders and electric only but still religiously fit the grommets. I suppose it's habit really but, at a pinch, I could perhaps argue that, although there's no vibration to absorb, they might save you a stripped servo gear when a control surface gets a knock?

Doesn't stop me rigidly mounting aileron servos sometimes though!


P.S. I have to admit, I don't understand what the problem is in fitting the grommets - unless you are trying to fit them with the brass ferrules already in place.

Former Member26/04/2017 19:39:31
3573 forum posts

[This posting has been removed]

Former Member26/04/2017 20:02:44
1322 forum posts

[This posting has been removed]

og26/04/2017 20:07:48
61 forum posts
5 photos

david - i take your point about vibration however its a balsa job with a large outrunner - so maybe best - now that ive done it

trevor - never had a problem before but it is the first time ive used hk sevos they dont have a cut away like normal - anyway all done now

Don Fry26/04/2017 20:22:48
4557 forum posts
54 photos

David, you are being provocative. And so to bed.

Josip Vrandecic -Mes26/04/2017 20:36:05
2993 forum posts
260 photos

Hi og ,maybe this also helps :



Edited By Josip Vrandecic -Mes on 26/04/2017 20:36:30

Former Member26/04/2017 21:24:38
1322 forum posts

[This posting has been removed]

ChrisB26/04/2017 21:29:51
1220 forum posts
34 photos

ferrules go in from the bottom

John Privett26/04/2017 21:32:46
6106 forum posts
243 photos

David, your i/c flying, well-regarded competitor friend is correct.

The brass ferrules are inserted from below so the wide, flat bit sits on the wooden bearer and the servo screw meets the 'sharp' end of the ferrule. But way, way, too many fit them the wrong way!

Former Member27/04/2017 00:32:47
3573 forum posts

[This posting has been removed]

Dwain Dibley.27/04/2017 00:48:03
1572 forum posts
1557 photos

It's method "B" for me, and I always use the grommits cos I've darned well paid for 'Em.

The screws should be tightened till they pull up to the ferrule, any tighter and the Grommit is useless. Ferrules fitted other way up will cut into bearers and squish the Grommits right down rendering them useless as before.


Nigel R27/04/2017 09:20:00
4271 forum posts
711 photos

Yup, option (b) for me. Whilst of course ensuring that none of the servo case is in contact with the structure.

If you're using a liteply tray to mount on, it does not hurt to toughen up the servo screw hole (and some surrounding area) with some thin cyano, to prevent the ferrules from squashing into the soggy liteply and improve the resilience of the thread which the screw cuts in the wood.

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