It showed a definite finite lifespan & the steel rivets were wearing down.  The space required to build it without adhesives was problematic.  They made a lot of clanking & felt like running on tin cans.

New plastic spacers using E6000 instead of hot glue worked quite well in testing.  

The cord locks could be ground a hair wider to make the string bundles actually fit.

The lion accidentally got cotton instead of nylon & it was definitely more abrasive.