Spool holder how to mount?

Hello,
I've been searching around for a simple spool holder for (for 38 mm center spools) mini kossel.
Found this
It seems to me that I can't insert the M3 nut to the extrusion stand since it is blocked by the upper frame.
Is there a way to insert the nut without removing the upper frame?

Can someone recommend spool holder (for 38 mm center spools) that can be printed in mini kossel & would be easy to connect to it?
I've looked at these as well:
1. [www.thingiverse.com]
2. [www.thingiverse.com]
3. [www.thingiverse.com]
4. [www.thingiverse.com] [really like this one but it's for 52mm center spools not suitable for 38 mm]
5. [www.thingiverse.com] [too big for my mini kossel]

Edited 3 time(s). Last edit at 09/28/2014 03:51AM by polkary.

make one

Hi,
Thank you for the replay.
I have made one but I would like to be able to connect to one of the kossel extrusions.
BUT the lines are blocked from top & I would like to learn how to connect to kossel without removing the frame etc' (if possible)

Hammer head nut. You can insert it into the channel and rotate it to lock in place.

Cool! thank you I didn't know it exists