Red90
One uses a heavy duty rod with a guard because on full lock plenty of the rod is exposed and is vulnerable to damage. I have one of JST's cast off guards on mine
This happened to mine Paul ! One morning when I started it, there was a bang, I lifted the bonnet and the shaft had sheared I found the pulley and end of the shaft on top of the inner wing
Mo
I'm happy to trial the new swb on an extended basis and my fees are really quite modest. Would you mind feeding that back for me
Good luck with your research, James, I look forward to what you've got to show us
Mo