Before making further alterations to the notch I tried a dry fit. I vacuumed aluminum particles from the inside of the bell housing and used a tack rag to catch any stragglers. Then I peeled off the opening's seal and set the flange in the opening, taking care not to push it in, which could damage the flange's triple seal. I used a bolt to hold the flange in place. The notch had enough clearance to put a socket on the fitting, but it was tight. So I replaced the seal over the opening (it had more than enough stickum left) and opened the notch a couple millimeters. I also made the notch a millimeter or so deeper so that, when bolted to the bell housing, the transmission case won't interfere with the socket. Finally, I "softened" the notch's edges with a flat bastard file (and no need to use a round motherflipper). The end result looked as though the factory had machined it, which was my objective.
I'm glad that's done. Now I'm waiting for the Supplemental kit to get here so I can install the Solution. LN shipped the kit today and it's scheduled to arrive on 2/17, a welcome break that will allow me to attend to some things I've been putting off, things that actually bring in money rather than consume it.
