the mounts?
well we have a box of metric bolts. (all shops do)
we try each 8mm or 10mm, ok one fits but is too short
so we go to store,
and buy longer bolts, using a ruler to measure what i need.
say i use a ruler and see i need, 3inch long bolts.(gren'go inches)
so 3" x 25.4 is 76.2mm or 75mm. long... (just and example!!!)
so if 8 mm fits i buy grade 8.8 or better bolts. in 8x75mm
(buy 2 bolts on in 8 and 10) and test fit them.
there is no other way. unless you have threads there.
do you?
if yes, any ruler and pitch gauge shows you what you have.
say the hole of thread seems like .31 inches, that is 8mm
and the pitch gauge shows.
most bolts this size are pitch 1.25
fine thread is 1.00 pitch.
all good shops (serious)
use this gauge.
http://www.amazon.com/Grip-Thread-Pitch-Gauge-SAE/dp/B004ROIU2A
ends guessing , and can be had for $2 on ebay.
ok i teach how to fish today.
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