The stretchable adapter ring that comes with the Dust Muzzle Ultra is not needed on all grinders. It is only used on grinders with the smaller bearing housings to prevent the hose clamp from pinching off.
The stretchable adapter ring that comes with the Dust Muzzle Ultra is not needed on all grinders. It is only used on grinders with the smaller bearing housings to prevent the hose clamp from pinching off.
The bearing housing is the part of the grinder indicted by #2 in the illustration. The bearing housing will vary in diameter depending on which grinder you own.
The upstanding fingers (3#in the illustration) are mode to collapse to accommodate different bearing housing diameters but if the bearing housing is too small, the hose clamp will “pinch off”, making it very difficult to attach the Dust Muzzle Ultra to the grinder.
If the bearing housing is too small, the hose clamp will pinch off the upstanding fingers of the Dust Muzzle Ultra.
The purpose of the stretchable adapter ring (#1 in the illustration) is to make a larger bearing housing so hose clamp pinch off does not occur.
The stretchable ring creates a larger bearing housing.
When the adapter ring is put onto the bearing housing, it presses into the annular ring of the bearing housing, providing a firm grip on the grinder head.
This is the stretchable adapter ring on a Makita GA 7911. It has a 2” bearing housing. Without the adapter ring on this grinder, the hose clamp would pinch off.
Recommended uses of the Adapter Ring:
4-5” Grinders
Bearing housing diameters less than 1.80” – Yes
Bearing housing diameters greater than 1.80” – Not needed
7-9” Grinders
Bearing housing diameters less than 2.50” – Yes
Bearing housing diameters greater than 2.50” – Not needed