We have one of these security handles that locks across the hab door that was fitted new

However, over time the grey plasticy bit you hold has deteriorated and become all 'wrinkled/withered' as shown here
Has anybody else had the same and has someone had a brilliant idea re some way of replacing this bit without replacing the whole unit?

However, over time the grey plasticy bit you hold has deteriorated and become all 'wrinkled/withered' as shown here
Has anybody else had the same and has someone had a brilliant idea re some way of replacing this bit without replacing the whole unit?