Hello Lockstock
Many thanks for the great videos!

Yes, chains should have some deflection, but should not be slack.
Your videos suggest too much deflection.

It appears to me that too little deflection will wear the chain;
too great deflection will wear the sprockets.

I attach a guide that may be of use.

Cheers
------------------------
Jack

Attachments
CHAIN INFO 01.pdf (474.64 KB, 6 downloads)
ROLLER CHAIN THEORY
CHAIN INFO 02.pdf (42.93 KB, 6 downloads)
ROLLER CHAIN THEORY