Makita LXT multiboard battery holder (bolted from front and back)

read front locking instructions as described in Makita LXT Battery Holder for Multiboard - T-bolt locked
rear locking instruction (same as i posted in comment in Multiboard - Makita Battery Holder):
you can use a 10 mm Mid Thread, Flat Head, T-Bolt from multiboard.io (https://thangs.com/designer/Multiboard/3d-model/10%2520mm%2520Mid%2520Thread%252C%2520Flat%2520Head%252C%2520T-Bolt-974085) and it screws from the back of the multiboard into the snap
this way you have a double-locked battery holder!

I took the front-bolted (using ‘Flat Head - Shank T-Bolt’) model from Makita LXT Battery Holder for Multiboard - T-bolt locked
and replaced it's back with the ‘10 mm Mid Thread - Flat Head - T-Bolt’ rear-locking snaps from Multiboard - Makita Battery Holder
all this to fit my DIY 8Ah 18v battery made from 10 old Dyson v11 21700 cells (this battery is so heavy I wanted it to be extra safe and secured)