Mount, Atari 600XL, Ultimate 1MB Upgrade

No-drill mount for installing an Ultimate 1MB Upgrade in an Atari 600XL. The U1MB board is mounted above the parallel bus port. U1MB information and installation manual are here:
https://lotharek.pl/productdetail.php?id=56

You will need to remove or modify the upper and lower metal shields to use this mount. While reinstalling the motherboard, hold the grooves of the mount against the edge of the motherboard between the cartridge slot and SIO port. Requires two M3x5mmL screws and optional washers to affix the U1MB to the mount.

After removing the shields, the parallel bus port cover will be loose as the metal fingers of the shield are no longer there. Print and insert the cover retainer over the port edge connector/circuit board and install the cover over it, centering the retainer between the ribs of the cover. If desired, you can apply glue or double-sided tape to adhere the retainer to the cover.

Photos show the early-model U1MB with black PCB and right-angle connectors. I