Yuba Kombi "Little Step" - Mounting System for Additional Foot Rest System for Shorter Passengers

In an attempt to make the ultimate Dad Bike, I purchased a Yuba Kombi and Monkey Bars to hold my 3-year-old son on the back. The foot boards Yuba sells are for longer-legged people, so I needed a stop-gap for a shorter rider to rest their feet. Hopefully this design helps at least one parent out there gave short-legged some foot rests to their little passenger. Making the Clips: For boards on both sides of the bike, you will need to print 4 identical clips. Material: Generic PLA was fine for me, but if you have something stronger feel free to use it. Strength: Print at 100% infill density at the finest resolution your printer will go for maximum strength. Supports: Print with tree supports at 30-degree threshold angle. Slicer Orientation: The model is oriented with supports being required over the bottom "V" section, allowing the circular clip to printed vertically for maximum strength and for the clip to flex on the right axis to clip on. Wood: I designed the clamps to work with a standard 1x2" premium wood board (1.5"x3/4" actual dimensions). You can pick up one board at the hardware store and have them cut to size - two 16" segments is what I used, although this can be adjusted to preference. I'm lazy and just have bare pine boards, but a higher effort and quality build would sand and paint them. Hardware: Clamping to the Bike: For tightening the clamps after installing around the support bars, you will need a M4x30mm bolt, corresponding nut, a washer ( 4 sets in total / one set per clamp). Attaching the Boards: If you use the recommended 1x2 wood board, you'll need a M4x45mm bolt, corresponding nut, and washer. You'll need 4 sets in total / one set per clamp). A set like this contains all the nuts, bolts and washers you'd need: https://www.amazon.com/Bemaka-220PCS-Button-Washers-Assortment/dp/B0CSYMCG8N/ Drill and 5/32" drill bit. You'll need to drill a hole in the wood for the M4*45mm bolt to pass through. I found the common bit size of 5/32" to be a good enough fit without having to find the more accurate but less common 4.5mm metric bit. Measuring Tape / Ruler. You'll need something to make your footrest even, matching the height down from the rear platform. Installation: Snap on the Clamps Once you have your clamps printed and materials collected, look at the angle of the back supports of the Kombi. Depending if you're on the right side or the left side of the bike, there will be an angle to the clip that will bring the mounting surface level. Clip your clips around the bars with the correct orientation, and slide them to the desired height. Mounting height will vary depending on the height of your passenger, but my son's foot comfortably rests when I set the clips 7" down from the bars of the Kombi's the rear platform. Snug Clamping Hardware Using the M4x30mm bolt, nut and washer, snug up the hardware but don't fully tighten, so you can still move them a bit and orient them perpendicular to the bike's support bars. Note the fitted cavity for the nut to slot into on the bottom side of the clamp. Fit Boards To install the wood platforms, place them on the correctly positioned clamps, and find a point to measure to make them the same on both sides. For my install, I brought the wood 1" back from the top corner of the rear clamp. Final Adjustment and Tighten Clamps Once the board lays correctly where you want it, check height and rotation of the clamps and fully tighten the bolt holding the clamp to the Kombi's side support bars. Marking and Drilling Boards Note that the clamps have two sets of holes - use the 5/32" drill bit in your hand to push through the correct hole so that the bolt will be straight up and down mounted to the platform and not at an angle. Once you've established the correct hole and have your platform board where you want it, use the drill bit from beneath the clamp to push up against the wood and make a mark. Take the wood down from the mounting clamps and make your first hole where you located with the drill bit marking. Drop a M4x45mm bolt from the top and place the wood back into the pair of clamps. With one bolt in and correctly located, make the mark in the opposite side of your board. Repeat the process of removing and drilling at your marked location. Install a washer and M4x45mm bolt from the top of the board, and tighten into a nut at the bottom of the mounting clamp. Note that there is a slotted key indentation to hold the nut while you tighten. Repeat adjusting / measuring / marking / drilling / installing hardware for the other side as needed.