Make contour sanders for convex and concave surfaces with short pieces of PVC pipe cut lengthwise. (It cuts easily with a handsaw, saber saw or band saw.) If you like, leave a section of the pipe uncut for a handle. Apply adhesive-backed sandpaper to the inner and outer diameters, or spray photo-mount adhesive on the pipe and apply regular sandpaper. You can match the PVC's inner and outer diameters to rounded or curved surfaces and edges so when you sand the contour, you'll preserve its original shape. Make a few PVC sanders in various diameters and you'll find yourself using them for all kinds of filing, sculpting and intricate fitting jobs.
Notched-Jaw Hand-Screw Vise
Hand screws are ideal for holding cylindrical workpieces if you saw notches in the opposing jaws with your handsaw (one small notch for thin pipe or dowels and a second, larger one for big stuff). Now pieces won't slip or revolve as you carve, sand or saw. And don't worry; your notched hand screw will still work fine for regular clamping jobs.