The drill whines!
A customer's (supposedly) Trek cyclocross bike—
the front derailleur bracket on Boon was loose,
so I had to fix it.
The frameset's generation is
quick-release, not through-axle, on both wheels,
but it has no cantilever brake mounts,
so it's disc-brake only,
and the mount is post-mount, not flat-mount.
That's the general picture.
I noticed the front derailleur bracket was loose
when swapping it to electronic groupset before the season,
but it was the week before the first Kansai cyclocross race in Minabe,
and time was tight. Since the main problem was
looseness in one of the three blind rivets—
two in front, one in back—
I drilled out just the one rear rivet,
lifted the front derailleur bracket up,
squirted instant adhesive in the gap,
and re-set the rivet.
But at the final race at Katsuragawa,
the front derailleur bracket was loose again,
so all three rivets needed re-doing.
Apparently they won their class at Katsuragawa in that condition.
Huh. Well then.
There's Kurondo Pond after Katsuragawa,
but it's outside the series this year.
The week before Kurondo Pond, on Monday I took the frame in,
Tuesday I set it up with epoxy and rivets,
and delivered it Friday.
I removed the bracket.
The white discoloration around the rear hole
is the residue from instant adhesive.
There's no trace of epoxy-based adhesive
on either the bracket side or the frame side,
so originally it was held only by rivets.
Well, it wasn't holding, was it.
When I drilled away the rivet heads
on the rear and the upper front ones,
the front derailleur bracket somehow came off.
↑The drill is in here,
but hasn't gotten to the point of blasting off the head yet.
The rivets weren't set properly.
For reinstallation, I decided to use
a very strong epoxy-based adhesive,
with the adhesive doing the main work and the rivets as a backup.
I'm using an adhesive with a slow cure time
in exchange for very strong holding power.
I sandwiched cardboard in there
to keep cable tie marks from appearing on the frame.
Made it in time for Kurondo Pond.
A customer's (supposedly) Trek cyclocross bike—
the front derailleur bracket on Boon was loose,
so I had to fix it.
The frameset's generation is
quick-release, not through-axle, on both wheels,
but it has no cantilever brake mounts,
so it's disc-brake only,
and the mount is post-mount, not flat-mount.
That's the general picture.
I noticed the front derailleur bracket was loose
when swapping it to electronic groupset before the season,
but it was the week before the first Kansai cyclocross race in Minabe,
and time was tight. Since the main problem was
looseness in one of the three blind rivets—
two in front, one in back—
I drilled out just the one rear rivet,
lifted the front derailleur bracket up,
squirted instant adhesive in the gap,
and re-set the rivet.
But at the final race at Katsuragawa,
the front derailleur bracket was loose again,
so all three rivets needed re-doing.
Apparently they won their class at Katsuragawa in that condition.
Huh. Well then.
There's Kurondo Pond after Katsuragawa,
but it's outside the series this year.
The week before Kurondo Pond, on Monday I took the frame in,
Tuesday I set it up with epoxy and rivets,
and delivered it Friday.
I removed the bracket.
The white discoloration around the rear hole
is the residue from instant adhesive.
There's no trace of epoxy-based adhesive
on either the bracket side or the frame side,
so originally it was held only by rivets.
Well, it wasn't holding, was it.
When I drilled away the rivet heads
on the rear and the upper front ones,
the front derailleur bracket somehow came off.
↑The drill is in here,
but hasn't gotten to the point of blasting off the head yet.
The rivets weren't set properly.
For reinstallation, I decided to use
a very strong epoxy-based adhesive,
with the adhesive doing the main work and the rivets as a backup.
I'm using an adhesive with a slow cure time
in exchange for very strong holding power.
I sandwiched cardboard in there
to keep cable tie marks from appearing on the frame.
Made it in time for Kurondo Pond.