Well, now I'm decidedly unhappy.
I was not able to get a reliable seal between the two stacked banjo fittings at the front master cylinder. Spiegler's replacement bolt is a double-wide version that accommodates two stacked banjo bolts. This requires 3 crush washers.
Suzuki specs 16.5 lb/ft for that bolt. Spiegler says to use only aluminum crush washers. I followed both directives.
I rode the bike for a couple of days before I noticed the leak, because it's only detectable when the lever is under hard pressure. It takes a few seconds to appear.
To try to remedy the problem, I advanced the bolt by 1/4 turn or so twice, checking the fitting each time with a paper towel. It continued to seep with lever pressure. I took the fitting apart, checked all surfaces for contamination, scratches, or other damage, and found everything in good order. Using new aluminum washers from Spiegler's kit (they supplied lots), I reassembled and refilled the MC. It still leaked.
This time, I went farther; I advanced the torque by 1/4 turn at a time past 16.5 to try to get the crush washers to deform sufficiently to seal. I knew I was taking a chance by doing this. At about the 25 lb/ft mark, with the fitting still seeping against steady lever pressure, the bolt finally deformed. Photos:
At this point, I'm dead in the water. The stacked banjo bolts with three crush washers simply don't seem to deform evenly and sufficiently enough to create a seal.
I've emailed Spiegler, who have been very responsive in my previous interaction with them, hoping they can explain what the problem might be. If I can't get a reliable seal without overtorquing the fitting, I'll have to go back to OEM parts. That would make this a very expensive adventure, especially if they're not able or willing to refund the front kit.
Has anyone any insight on this problem?