Ummm... Caliper:
Not caliper:
I need you to measure the OD of the splined part of the hub side of the axle, I need a high and a low measurement. (Measure 4 or 5 places around the axle's splines, take the highest and lowest numbers.)
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"