unless its an age thing, you should be fine, thier only a cheap 8$ saw w/ a 6in blade,
its alot safer than using a knife or "gouge"
or you can use a pringle can cut in 2in sections make 2-3 layers then "laminate" it w/
instead of a saw you could use a triangle file
(for wood, it has wider grooves then ones for metal)
or sand paper around a ruler
a saw just goes faster, also could use a "dremel" tool (small rotary multi-tool)
and a "cut off wheel/disk"