I know what you're saying, I've been doing this myself for years now, since I go through a set of cylinders every 100-150,000 miles. For me, that is basically yearly.I am not saying that the slave cylinder of the del sol is identical to that of the insight.
what I am saying is that the Civic 1992-2000 and del sol 1993-1997 uses the same slave cylinder Honda pn: 46930-SR3-013 and the moving part inside is the same as the one inside the slave cylinder of the insight gen 1
We can use this part to repair the slave cylinder of an insight. Personally I took my piece in a scrapward and don't know if it was an OEM or Aftermarket cylinder. So I guess we can buy a part for about $ 7 from rockauto and use it for the repair, but I didn't do this test.
I hesitated a bit before doing this post because I guess if everyone starts buying civic parts for their repairs, the few companies that do aftermarket parts for us risk shutting down production sooner.
that's why I recommend buying the real part of insight and keeping the old one as a spare part
The 2000-2006 Insights use a custom cast slave cylinder, with a standard 3/4" piston bore. What you did is remove the piston and seal from another Honda model's slave cylinder with the same diameter and style piston, then put it in your old slave cylinder casting. It's a valid fix, and it's a whole lot cheaper than paying for actual aftermarket Insight slave cylinders at $50 a pop. For others looking to do this, use late 90's Hondas as your cross reference; I used a 1997 Accord as my part lookup on RockAuto the last time I ordered some, but Preludes and Civics use the same style of piston too. The last ones I ordered where a whopping $6.14 for a Perfection 37889 slave cylinders. Buy it, pop out the piston and seal, trash the new casting, then put the new piston in the cylinder bore of your old casting and you are back to new functionally. It helps to clean up the inside of the casting bore with 400 grit or higher sandpaper, to break any glazing that may be present. Use a 9/16" deep well socket with the sandpaper wrapped around and taped to it to hone out the cylinder bore. Then rinse it out with water or solvent, lube it with brake fluid and insert the spring and new piston with new seals on it. I recommend keeping the OEM Honda spring from the old slave cylinder, since they are made with heavier gauge wire and seem to be better in quality than the ones that come with the new slave cylinders.
One thing that I don't recommend is using any of the old Dorman slave cylinder repair kits, if any are still floating around out there - those things were crap. The piston seal material was incompatible with brake fluid, believe it or not. I had two of them that I used, and never got more than 10,000-15,000 miles out of them before they failed. I actually had to change the last one out on the road when it failed. From the moment that I installed them, the brake fluid would start to turn black, which was a dead giveaway that the seals where deteriorating from the get go.