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[Bent valve]

You can get stone cutting discs for 4 inch grinders....you can even get diamond ones! I use them for re-finishing the chamfer on to clay pavers after cutting.
I have a cheap 9 inch grinder which gets used for nothing more than stone/concrete/brick cutting and its been great. Its lasted long enough to wear out 2 diamond blades!

People often confuse 4" grinders with 4 1/2" grinders, which are the norm.

 All manner of discs are available for 4 1/2" (115mm) grinders, but 4" discs are hard to obtain nowadays

[Andy B]

.......
 All manner of discs are available for 4 1/2" (115mm) grinders, but 4" discs are hard to obtain nowadays

I suppose I should have been a bit more selective with my redundancy package when I left Halls sweets!!!        

[eddie]

Dont forget Goggles/face mask and levver gloves! Keep a towel and a bucket  of ice nearby in case you cut off a finger or two

AND watch where the 'Flak' is going, a guy who was cutting a sill for me ruined a new double glaze unit by embedding bits  of concrete in the glass!

eddie

[Andy B]

Dont forget Goggles/face mask and levver gloves!  ......

I've loads of PPE!!  

[Martin_1962]

Petrol are good as you can leave them in the boot of your car and park where you want.

[Andy B]

Petrol are good as you can leave them in the boot of your car and park where you want.

Wouldn't a battery grinder be a bit more convenient?  

[Martin_1962]

Petrol are good as you can leave them in the boot of your car and park where you want.

Wouldn't a battery grinder be a bit more convenient?  

Hopefully