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the catalan connection
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Discussion Starter · #1 ·
For those with some skill and want a longer lasting middle ring to replace the older aluminium one on his 760 cranck, here it goes:
1-First had to lime down the spider a bit at the area shown in the pic.Just by hand and didn´t need to take more than 0.5mm off. That small aluminium rise wouldn´t let the flat part of the 770 ring rest properly.
2-Cut a 0.8mm polycarbonate sheet to desired shape.
3-Assemble!

NOTES: I´m not 100% sure a 0.8mm spacer is the right thickness. I just trusted my eye. Might be that a thicker one fits good too. If a thicker than 1.2mm doesn´t throw the ring way too inside it may be not necessary to lime down the spider, as the rising lid is no taller than 1,2mm, roughly.


Cheers!
 

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the catalan connection
Joined
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1,266 Posts
Discussion Starter · #3 ·
Yes, but was much easier to cut the polycarbonate to the right shape.
 

·
the catalan connection
Joined
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1,266 Posts
Discussion Starter · #5 ·
NDEBT said:
Is it just me or does that middle ring look backwards. I haven't see the m770 rings, but it looks like the shift pin is on the wrong side in the photo.
No, you´re seeing the backside of the shifting pin(rivet-like fixing) Look at the right side of the 4th pic, a bit blurry but you´ll see both sides.
 
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