I know this is an old topic but I learned from it and now I have something to add.
Like most, my chieftain [2016] lacks both sissybar and rear storage rack.
this makes mounting a flag rather difficult.
Here is what I did to mount 2 flags onto the motorcycle.
The end result looks fairly professional and yet obtained fairly inexpensively.
parts needed to mount 2 flags onto Indian Chieftain (mine is 2016)
* amazon #B0791NB4FM which is a listing for 2 LAMPHUS clamps $10. these appear to be made from aluminum and are powder coated.
* google search for the 4 words... motorcycle side mount flag
look for listings where the picture has the 3 elements of: flagpole, mounting-pin and your desired apx 6x9" flag.
Typical listings are $12 to $22 each some ebay listings are 2 for $20. A sample Amazon listing is B07MQ5D7Z8
* from local Hardware store/anywhere:
Stainless: M5-8x25mm Socket head bolt (two per clamp) (the bolts that came with clamp too short for our install)
Stainless: M5 flat washer (2 per clamp) (Note: without a flat washer I found our bolt will bottom out)
Stainless: 8mm flat washer (2 per clamp) [for each side clamp when we mount pin onto clamp]
stainless: nylon lock nut (1 per clamp) (secures the pin and flag onto clamp) probable size of the threaded pin in your flag kit is 8mm
* "gorilla tape" - we use this black duct tape as a protective gasket to MC's saddle bag mounting tube/post.
* Allen keys (above kits might have included them)
* blue locktite
* 13mm ratchet wrench if you have it or one can make due with a 13mm open end wrench
-
Install:
* remove saddle bags (no tools needed) would be very difficult to install our clamp with bags in place.
* put 1 strip of gorilla tape around rear saddle bag post.
we need to cut the tape so that both length and width wrap just once with no overlap.
Here is a suggestion to make above measurement...
wrap the non-sticky side around saddle bag post
you now know the spot to tear the tape from the roll.
[it is ok if fractional inch short, but overlap will cause you grief]
use same technique to find the spot to rip our strip lengthwise.
[like before - it is ok if fractional inch short, but overlap will cause grief]
you now have a strip which exactly "fills" the outside of the saddlebag post
wrapping it length and width with no overlap
go ahead and apply tape to post.
I suggest that joint/seam be either straight up (or down) as to maximize the holding force of tape when clamp is around it.
* remove OEM bolts from clamp place one half of clamp onto each side of your saddle bag post
(I found one can not get clamps around post unless both bolts are fully removed)
orient the two half's such that the tab is on top pointing forward
and with bolt holes are pointing backward.
- hand thread your bolts into clamp remembering to use the clamp's OEM lock washer, the hardware store flat washer(s) and blue locktite
- now that bolts are hand threaded without a cross threading
rotate clamp so tab is verticle,pointing upward and on rear side of post.
the bolts of course are on the the bottom.
- tighten bolts fully. NOTE: there is NOT a need to use much force when tightening.
the "teeth" on the clamp are pretty aggressive. Their sharpness/aggressiveness
is the primary reason we used the gorilla tape as without the tape
the clamp's Teeth would damge the Motorcycle's saddlebag post.
We are simply looking to tighten the bolts so that should you manually apply
apx 20lbs of force applied to clamp it will not move/rotate.
* locktite your flag mount onto the pin that came with the kit.
* locktite the nut which came with kit. you need to tighten to a point so that the flag can not possibly "spin" on the bolt
* thread a flag onto flag pole remembering to locktite the cap
you are essentially done. go ahead reattach staddle bags.
With the above setup.
the clamp will be on bike 100% of the time - however it is almost completely hidden by saddle bag.
When you want to run a flag...
insert pin into clamp with a flat washer on either side of the clamp.
use your 13mm wrench and tighten the stainless nyla-nut.
Note: since as both bolt and nut are stainless steel you can tighten as hard as you wish
BTW:
* you can do the above nyla-nut with the staddle bags in place.
* the clamp hole is way bigger than the bolt - that's ok
the force of the stainless nyla-nut will prevent movement.
* the nyla-nut should not need loctite but it would not hurt if you used it.
