First let me say assembling your own flex cable and prop shaft is a great way to save some money. There are a couple of methods used to attach the prop shaft to the flex cable. The Soldering method which Octura recommends is outlined in directions that come with Octura parts. But I feel the soldering method is harder and more prone to error than the way I'm going to outline in this article. We use the glue method.
Next we are going to measure how much of the flex cable fits into the prop shaft hole. We are going to lightly sand that part of the flex cable. This will help give the glue a better bite on the flex cable and remove the plating, like in the below picture. After this is done take your rag with alcohol on it and wipe down the end of the sanded flex shaft. This will help remove the oils and fillings. Set the flex aside to dry off completely.
Next to help the glue bite to the inside walls of the prop shaft hole we are going to "nick" the inside walls of the hole. This is done easily with the drill bit by sliding up and down at an angle at a slow to medium speed on your dremel tool. Try to nick up most of the area inside the hole. Take care to not drill to much. It should take no longer than 30 seconds to do this. Than tap it on your bench again to remove the fillings inside. If you don't have any fillings come out, there can be a few reasons. You didn't have a sharp enough drill bit and the process needs to be done again. Or it could be that when the original prop shaft hole was drilled the manufacturer could have left behind some cutting oil which the fillings are binding to.
Now we have to thoroughly clean the inside of the prop shaft. We first need to tightly twist/wrap a piece of paper to a size that's a bit larger than the prop shaft hole. We use the scrap octura packing that comes with the flex cable for this. Than dunk the paper in to rubbing alcohol.
Now that we're done prepping the parts its time to start gluing it all together. We are now going to coat the inside of the prop shaft hole first. The Loctite 603 is so thick that it won't flow inside the hole on its own. I use scrap ends of plastic tie wraps to push the glue inside the hole and rub it on the inside walls making sure to cover all the entire area.
Next make sure the flex is dry by wiping it with a clean rag. No grease should be on the rag. If there is grease showing on the rag clean the shaft again with alcohol. Than use the glue to cover the part of the flex shaft that will be in the prop shaft.
Next we are going to assemble the two pieces. This is the easy part. Just slowly push the flex into the hole and twist it a bit. Some glue will come out. Just wipe it with a clean rag.
Allow it to dry a day or so before use.
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