Not a 100% sure but if you turn the lock shield off (turning it clock wise) till it's closed and fit a decorators cap to tvr end that might solve your problem regards david
Exactly that being said the customer paid for materials when I arrived with them and even gave me a tip on completion lol, I always find it's the way nes with money are the only nes to watch imho
Another alternative is to get the customer to pay for materials upon materials turning up, or you bringing them. I've used this method before when I had a doubt over the customer intentions