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FastTT Universal Mounting System Installation Guide
If you are only using the spacers for mounting and not
including angled posts, you should file off the round locator
domes on the top of the uppermost spacers. Do not file off
the locator domes on the spacers mounted below as this will
compromise alignment.
The following illustrates where your mounting bolts should be positioned.
For all hole centre-to-centre spacing that is
more than 15mm but less than 38mm, you
should slide the spacer or angled post as far
forward as it will go until the mounting bolt
sits flush against the back edge of the holes.
Failure to do this will cause the spacer/post
to slide forward during tightening and will
change the bar position measurement. This
is NOT necessary if you are using our tall
stack bridge as part of your mounting
system (see next section).