Because they were used and abused in the jungles of Malaysia or to put it another way............... rode hard and put away wet
You could say the frequency of inspection and quality of maintenance went down hill after Mr. Laidler left the area.
"Now this is the Law of the Jungle, as old and as true as the sky.
If you don't oil and grease it, your Enfield will rust and die."
by Rudyard Laidler Kipling
Ah, buff that right out!!!
So I can't spell, so what!!!
Those who fail to learn from history are doomed to repeat it.
Those who beat their swords into ploughshares, will plough for those who don't!
Be polite. Be professional. But, have a plan to kill everyone you meet.