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Old 23-09-2011
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Default BJ4 hinge pin retention - how to improve?

A few times now, the rear hinge pins have worked their way loose, sliding forward or back and resulting in the pin bending and/or the wishbone breaking. It's getting tiresome hoping those fiddly little grub screws will hold the pins in place when they clearly don't work effectively.

Are there any tricks or mods to keeping those blasted pins in?
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Old 23-09-2011
Richard Lowe Richard Lowe is offline
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On mine I used to put a flat on the hingepin using a dremel cutting disk for the grubscrew to locate onto, just like a pinion.

Jimmy did the same in the BJ4WE review, top right of page 5...

http://www.oople.com/rc/photos/reviewbj4we/page05.html
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Old 23-09-2011
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Quote:
Originally Posted by Richard Lowe View Post
On mine I used to put a flat on the hingepin using a dremel cutting disk for the grubscrew to locate onto, just like a pinion.

Jimmy did the same in the BJ4WE review, top right of page 5...

http://www.oople.com/rc/photos/reviewbj4we/page05.html
Cheers Richard, it's about the only niggling problem I still have with the BJ4. Still plenty of life in it if this works.

Would you recommend a tiny spot of threadlock or superglue on the grub to persuade it to stay put, or is that a bad idea near a hinge pin?
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Old 23-09-2011
Richard Lowe Richard Lowe is offline
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Threadlock for sure! The pin is meant to stay put in the blocks and pivot in the arm, so a bit of excess threadlock is fine so long as it doesn't impede the arm.

I used to dump loads on to make sure it never came out, in fact when I built a kit up usually the pins would stay put in the front block for the life of the car
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Old 27-09-2011
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I swapped the grub screws out for short 4-40 cap heads and just torqued em up. Never moved after that
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Old 27-09-2011
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You can also superglue the hingepins into the front block.

if you ever need to remove it, just heat the block and hingepin with a soldering iron. The other suggestions are good too.
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Old 27-09-2011
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I made the flats in the pins and used plenty of threadlock. I'll be ordering a load of imperial screws soon, I'll see if i can get stubby 4-40s. The same supplier does 1/8 and 3/16 grubs, the latter being 3 times cheaper!
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Old 28-09-2011
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Quote:
Originally Posted by colmo View Post
I made the flats in the pins and used plenty of threadlock. I'll be ordering a load of imperial screws soon, I'll see if i can get stubby 4-40s. The same supplier does 1/8 and 3/16 grubs, the latter being 3 times cheaper!
Havnt ordered from this site yet but will be pretty shortley.............

http://www.modelfixings.co.uk/index2.htm

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Old 28-09-2011
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Yup i use Modelfixings to get screws and always been top service
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Old 29-09-2011
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£1.20 for 5 measly grub screws? I found a company selling 4-40 3/16ths for around £10 + VAT for 100, more in line with metric hardware prices.
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