Sharon,
The dust collection on the small grinder really isn't that great, it will throw around a lot of dust and the bag clogs up easy. I'm planning on adding a larger bag to get more filtration surface and lessen the dust missed by the current suction system. The great thing about this little machine is it's small foot print and the small diameter of the sanding wheel, it's only 3 inches and allows you to get into tight spots.
Here's a picture of the glass slipper or the tape fitter Sharon referred to for those not privileged enough to be part of the traveling chapter of the New England shoe and bootmaker's.

It's made with regular clear packing tape.
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First I start with a soft EVA insole. As my lasts are custom and mostly anything but smooth on the bottom I have to crate a balanced surface.
I would sugest using a thin EVA insole, 1/8” should do fine. Tack it to the last and trim as you would with any insole.
Next you apply a layer of tape, sticky side out over the ball of the last. On the bottom you fold over the tape to have a strip of about an inch to stick to the insole.
Apply another layer the same way slightly overlapping the first layer. Now take the tape, sticky site down and go over the ball where the layers overlap. You now have created an area to hold on to the last and not get stuck to it

as well as an area to anchor your other layers to. (the sticky tape exposed on either site of the layer you put sticky side down across the ball)
From here I go around the heel, around the toe and over the cone sticky side out. Next the same thing but with the sticky side down and the basic fitter is ready. If you use a light grade tape go over it again with a layer of tape for strength.
One word of caution, if your tape has give to it do NOT pull it to get it smooth over the last as it will shrink when you pull the last and the fitter will appear to tight.
As the fitter is plastic, not leather the feel will be different. I judge it to see if there is enough room, around the toes of course but also if hammertoes, bunions and the like will have enough room. Walking with those doesn't work all that well, you would have to put a wedged heel on it. I'm not worried about walking with it in this stage, once I know I have a fitting last I go to a leather fitting shoe to check the functionality.
Rob