In reply to jkarran:
JK - The rollers are solution treated / aged 7075 - the same material as used for the back bar.
In terms of clarity this was part of a mail sent to the OP yesterday along with a request to get the biners back for examination:
"I would just say that I have never seen wear like this on a Revolver before. It looks as is one side of the pulley wheel has been ground away in the worst case image.
The 16mm rubber retainer is too wide to sit correctly in the top apex of the Revolver and might cause offset loading as mentioned in other replies to your post on UKC – if this is combined with dusty/gritty conditions and long lowers it might be possible to get serious abrasion of the pulley roller.
- Grit gets in the space between the back bar and pulley wheel
- The rubber retainer – especially with a stiff QD tape - stops the Revolver from sitting correctly and the Revolver is held at an angle.
- Thus on being loaded the roller is forced - on the end which is lower – against one side of the pulley recess in the back bar.
- On rotation abrasion will likely occur between the side of the pulley and the side of the recess that are being pushed together – this will be under load and potentially at speed aggravating any possible wear..
Pure speculation, but potentially an explanation."
Our new indoors test tower is now up and running and I'll try to get some simulated tests going
Regards
Simon Marsh
DMM International