Found this here on VTX CAFE posted by JAYBOVAY. Is for the C but F SHOULD be the same. For the price and limited options, would be worth a try I think.
Found this uhhhh somewhere else...
>Buy: one heel/toe shifter for a
VTX 1300 Retro and the two rubber pads for the shifter (The linkage connecter comes attached but the pads must be installed... hold them under the hot tap water for a minute and they will be easy to push onto the shifter) (These parts, I bought from HDL.)
Now
>Go to Ace Hardware and buy two #93 "O" rings from the plumbing section and one #8 (metric) stainless washer from the nuts and bolts section.
>Obtain an aluminium drink can (beer,cola etc...).
>You will also need some moly-grease.
The operation:
(A bike jack/lift is needed to gain clearance for this operation)
1) Raise the bike on the lift,
2) Remove the shifter assembly from the bike,
3) Remove the shift pivot bolt from the bracket,
4) Loosen the lock(jam) nut on the shifter linkage, (do not turn it past the point of lose and let the nut stay at that point on the shifter rod, the new shifter will be adjusted to the same point and locked down by tightening that nut).
5) Turn/spin the shifter and remove it from the shifting rod.
6) Clean the grease and remove the seal from the shift pivot bolt.
7) With a pair of tin shears, cut a strip from the aluminium can that is (as in the picture) wide enough to cover the "shoulder" area of the shift pivot bolt.
8 ) Wrap the strip around the pivot bolt to get two full wraps and cut it to that length.
9) Roll the strip and insert it into the new shifter, (see photo).
10) Push the pivot bolt into the shifter and check to ensure that the rolled strip does NOT extent out of the hole on the shifter on either side... if it does, trim the strip so that it only fills the area needed.
The assembly:
1) Install new shifter onto the shift rod and turn it in to the position of the jam nut.
2) Place one #93 "O" ring onto the pivot bolt.
3) Insert the rolled strip (sleeve) into the new shifter.
4) Lube the pivot bolt with moly grease.
5) Insert the pivot bolt into the sleeve being careful to keep the moly grease off of the bolt end (threaded portion).
6) Place the second #93 "O" ring into the seal channel on the opposite side of the shifter.
7) Place the #8 washer onto the threaded portion of the pivot bolt and install this assembly onto the shift/foot bracket. (as you turn the pivot bolt the "O" rings will seat into the seal channels and keep the grease from oozing out. Tighten the pivot bolt.
8 ) Reassemble the foot bracket to the frame, check for proper clearance of the shifter and tighten all bolts. DON"T forget to tighten the jam nut. After checking to make sure all bolts are tight. Get that bike off of the lift and go enjoy your new shifter
You do NOT have to be a master wrench to do this mod... All you need is regular hand tools and basic knowledge.
Here is the info you will need:
From HDL, buy the following;
1 ) 1 OEM Heel-toe shifter for the VTX 1300 Retro.(linkage coupler is installed)
Pt# 24710 - MEA - 740 @ $32.27
2 ) 2 Rubber shift pads for that shifter.
Pt# 24781 - 371 - 000 @ $2.84 ea. ($5.6
Total cost $37.95 (add $5.00 handling if your order is less than $100.00 [$42.95])
Here's the link with pics.....
http://www.vtxcafe.com/showthread.php/60913-1800c-Heel-Toe-shifter