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Hi everyone.
I just received a replacement gear drive head for my Echo SRM4000 strimmer/Brush cutter.
Please can someone inform me what this hole is shown in the photo, red .

Thanks and regards
Welsh Bloke

I must be going blind as I see nothing as the Sargent from Hogan Heroes is always saying, just a red circle.

StarTech said:

I must be going blind as I see nothing as the Sargent from Hogan Heroes is always saying, just a red circle.

Click to expand...

Thanks Start Tech......picture now uploaded.

That is usually where you insert a rod of the correct size to lock the gearbox for trimmer head removal and installation.