![](http://www.merciancycles.co.uk/wp-content/uploads/2010/08/P1130937.jpg)
![](http://www.merciancycles.co.uk/wp-content/uploads/2010/08/P1130935.jpg)
The first picture you see is an insert for use with a belt drive system which seems to becoming popular. The second is the keeping rings for S&S couplers. These keeper rings are changed just before the spray shop and of course before delivery to the customer.