Because of the svg files this is indeed the only way to change parts most of the time. Your part has a .043 hole size (much to large) so I reduced it to .030 and set the pad width to 20 thou (which is the usual size). You can check hole sizes by file>Export->for production->gerber and then edit the .drill file with a text editor:
Untitled Sketch_drill.txt
original:
; NON-PLATED HOLES START AT T1
; THROUGH (PLATED) HOLES START AT T100
M48
INCH
T100C0.043307
%
T100
X016222Y015222
X017600Y015222
T00
M30
new one:
; NON-PLATED HOLES START AT T1
; THROUGH (PLATED) HOLES START AT T100
M48
INCH
T100C0.030000
%
T100
X017222Y013222
X015844Y013222
T00
M30
Inkscape has any number of issues, but does work with Fritzing if you select save as then plain svg as the save format (although even then you need to edit the output file and make some changes such as remove the px from font-size).
Electrolytic Capacitor_1.fzpz (8.0 KB)
Peter