Good mod. Helps quite a bit. Although you can make one for about 10 cents, I bought mine.
Funny story...
A guy retires after years of working as lead engineer on an assembly line for a big company. Several months later, the line breaks. The in-house engineers can't fix the problem. They call in the machine factory reps and they can't fix it either. It's costing them thousands each hour the line is down. In frustration, they call the retired guy. He comes in, looks over the line... and after about 10 minutes of perusal, puts a screw into a hole in a mechanism buried deep in the machine. It starts right up and chugs along as new - to everyone's amazement.
The next week the owner of the company gets a bill from the guy for $10,000. He calls and says "how can you bill me for $10,000 for 10 minutes of work? I need a breakdown on how you justify this bill".
The response?
1 Screw - $0.10
Knowing where to put it - $9,999.90