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Here are the results of the Bristle Brush. There was a small learning curve. For me the slowest RPM with light pressure provided the most controlled cleaning. I used a angle die grinder but it is difficult to control the speed at low RPM/light load. A angle drill would probably work better but I like the lightness/small size of the die grinder. I may try the drill on the other head. Overall I was very pleased with the results. I did not get near the valve seats.
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 Tony H
W111 280SE 3.5 Coupe
Manual transmission
Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT
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