Possible Clues:

• Made glare over last letter for one concerned with Casement perhaps
• Worker with glass
• Craftsman less inclined to work after end of morning
• Windows expert beginning to get worse at work?
• Skilled worker becoming ultimately less industrious
• Light fitter doing less work after start of go-slow
• Tradesman beginning to grow more work-shy
• Not doing so much to chase good tradesman
• One may fix lights, being ultimately less industrious
• One using putty, good at first then less inclined to work?