Gremlin 4mm L-Shape Tuning Wrench

I had an autoharp tuning key that kept sticking on the pegs, requiring brute force to remove once the peg was tuned. which then moved the peg back out of tune, resulting in an untunable autoharp. I am loathe to gush such praise upon a simple tool like this, but if the former is your problem, this tool will fix it. I now have a functioning autoharp!

I brought this to restring/tune an old zither I am restoring for a friendCame fast and works perfectly

The tuning wrench is fine. Unfortunately it is not 4 mm. I measure it at 4.6 mm using a digital caliper, which means it's a rather loose fit on my tuning pins. Of course there needs to be a bit of play but this is too slack for my 4 mm pins. I'm sure it's suitable for other pins. Makes it difficult to rate it with the stars so I gave it 3.

To stop my grandaughter and grandson whinging that they "couldn't find anything to do!"

Exactly what I needed for my antique zither. It fits perfectly.

Did the job!

not too bad, the wrench arrived ok, it was a bit loose on the keys it had to fit,so I found a clock menders tool that was a better fit.