A ring. The rope pulley 21 nicely fits in the triangle formed by the angular block 60 and the building block 7,5.
Marten70 (12.5.2012, 23:51:12)
Nah, dass ist stark! Wie fest ist das Rad geklemmt?
mfrGr Marten
winijenh (13.5.2012, 00:05:02)
It holds very well. You have to push it in with a bit of force.