Long reach Pole saw

[Jack.P]

Hey guys 

had the new Stihl HT133 pole saw out again on a job this morning.

Cut some bigger stuff  to start with and all good then some smaller holly branches which caused the chain to come off which broke the chain tensioning parts again .(already fixed it once )

When this happens and the chain comes off the bar what exactly can cause the parts to break if they weren’t previously over tightened and chain has always  been  set at right tension 

i am finding its superb for bigger stuff but no good at all for anything smaller than a thumbs diameter and won’t even bother trying again on those titty twigs  after this carry on

Thanks