FB2020 Addon more rigid Y Rod Holder

Latest update for FB2020 introduced new Y-Rod holders which are fixed by one Screw. After a few days the Holder satrts to bend downwards. Therefor i redesigned the original Holder to have 2 Screw-Holes. It is required to remove the inner corner brackets to free up space for the new holder. I used http://www.thingiverse.com/thing:98234 to fix the front / rear and on top one L-Bracket http://www.thingiverse.com/thing:1634270.
Original Design of holder:
https://github.com/AxMod3DPrint/FB2020
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