A quick video of some of the mods I've done to my Sim Jack Pedals. If there is enough interest I'll do a more detailed video as well as some details on some of the other custom items on my rig.
8x14x4 Flanged Bearings https://www.amazon.com/dp/B085D8TB8Z?psc=1&ref=ppx_yo2ov_dt_b_product_details
8mm Tube: https://www.amazon.com/dp/B07ZDN8WSL?psc=1&ref=ppx_yo2ov_dt_b_product_details
You'll need some 8mmx10mm washers as well. I picked these up at my local hardware store.
Rumbler Mounts: https://www.etsy.com/listing/1479702730/rumbler-mounts-for-sim-jack-pedals
Complete Rumbler Kit: https://www.etsy.com/listing/1519944142/sim-racing-pedal-rumbler-kit
If you're interested in a 'kit' send me a message, and depending on the response I'll put some together.
Also if you're interested in the rumbler brackets, let me know as well.