As many of you have already stated, boreas' fix is elegant, and effective. I had a Technics dustcover with one broken tongue, so I got things set to follow his lead and fix it.
I tried to find a Vaughan "Bear Saw" locally, and had no luck. In my area Lowe's carried a larger sized one with coarser teeth. I enquired about their ordering a 'Mini' and although they said they could, it wasn't in their 'system' so that turned out to not be an option. I realized I could order one from Amazon, but I wanted to see if I might have another tool that would work.
I looked around my shop to see what I had that may work. I found a very badly damaged dust cover that had no turntable to mate it to, and decided to use that for my 'guinea pig.'
For a tool, what I found for a saw was
this Bosch Pocket Saw.
Its basic design and function is as a 'holder' for jig saw blades. One can change the position of the blade, so you can have a more traditional saw with the handle perpendicular to the blade.
I grabbed several of my Bosch jig saw blades, and tested them out on my guinea pig dustcover. I found, as I expected, that fine toothed metal blades (118A -- 17-24 teeth/inch or 118G -- 36 teeth/inch) worked great.
That settled, I set to work to cut off the broken tongues. I slightly modified boreas' method (if I understood what he did correctly) and cut off all of the horizontal material that made up the tongue (i.e., I left the buttresses, but not the 'base' they rest upon as boreas did (see pics below).
After carefully cutting off the tongues and their base, I made my replacement pieces so that the remaining buttresses rested on the metal of the new tongue. I followed the rest of boreas's procedure, but made one more modification.
Because the dustcover's rear is now slightly higher than the original (the aluminum material used as the replacement tongue is slightly thicker than the original), one needs to, as boreas pointed out, slightly raise the hinges out of their sockets so that the cover will full close at the front.
What I did was cut two pieces (one for each) of scrap rubber I had to fit in the bottom of the hinge receptacle on the back of the TT. This raised the dustcover as needed, and I felt was a good way to ensure that the dustcover didn't get pushed down too far in the hinges at some point in time.
The 1/8" tongues fit the hinges very well but they're slightly thicker than the originals. That means that the hinges have to be raised up out of the sockets they fit into very slightly in order for the cover to fully close. A small matter and a fair trade-off for repairing an otherwise usable dustcover.
In the future, I am going to see if by cutting a notch in the dustcover that is equivalent to the thickness of the replacement tongue, one may avoid the problem of a dust cover needing to be raised to close properly.
Hats off and thanks to boreas for supplying us the inspiration to do this repair. I hope my post will help us realize that you may already have what you need in your toolbox or shop to do these types of repairs.
Oh, one last thing -- I used one of my metal jigsaw blades to cut the aluminum. Came out very nice. I little buffing from a wire wheel made the replacement tongues look factory fresh.