this post was submitted on 03 Jun 2024
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One thing I've always wanted for my space-constrained homegym is a leg press. But even the most compact leg presses occupy a lot of space lengthwise and width-wide. I had my eye on the Force USA 45 degree leg press/hack squat combo machine, because it has so much capacity for me to grow into. So I picked one up and modified it so it can be placed up against the wall.

The primary issue is the barbell that attaches to the carriage (the part that moves up and down). This barbell extends about 45 cm (18 inch) beyond the left and right sides of the machine, taking up stationary space as well as dynamic space when the carriage is in motion. Eliminating that barbell would reduce the width requirement from the bare minimum of 162 cm to 80 cm, assuming the weight storage pegs are also removed.

But of course, the barbell is how the leg press is loaded, with 34 cm on each end for Olympic-spec plates. It also provides some structural stability for the hack squat shoulder pads, where they attach to the carriage. However, dangling underneath the carriage is a much-smaller space for loading plates, with 20 cm on left/right for plates.

Force USA leg press under-carriage plate holder

As an aside, this is a fairly substantial machine that arrived on a pallet, taking a few hours to assemble. The build quality is exemplary, and everything about it evinces durability and stability.

My approach was to remove the original barbell, loading only the under-carriage bar. To retain structure, I cut 1"x2" rectangular steel tube to the width of the carriage (59 cm), capped the ends, and drilled holes to reuse the same bolts as the original barbell. The reason for 1"x2" is because the backrest for the hack squat requires clearance; the stock barbell solved this by bending around that area, whereas 1x2 just barely clears the backrest, and that's good enough for me.

top-down view of replacement steel tube and mounts

Later, I added a pair of wooden mounts where a conventional barbell can be rested. This is not my proudest woodworking achievement, but it's certainly the most unconventional. Each mount is made from three layers of reclaimed 2x6 lumber (from a bed frame) glued together, then a 3.5-inch diameter hole bored through axially, then sanded, stained in cherry, and finished with Polycrylic clear coat for durability. I'll explain the point of these mounts in a different post.

left-side wooden mount on the leg press

The result of all this is a leg press that needs only about 1 meter by 2.4 meter (39" by 96") of floor space, and that's including weight storage pegs on the side away from the wall, plus space to swing the safety stopper bars in/out of place. And everything can be reverted back to the factory configuration.

The caveat is that I'm consigned to the 40 cm total barbell space under the carriage. To maximally load this machine, I would need to invest in thin iron plates, which apparently only are made to precise values, and are thus expensive. Examples: Rogue calibrated KG plates, and Hansu Power calibrated plates, both of which are 22.5 mm wide for 20 kg plates. Sixteen such plates would make 320 kg (700 lbs), and I'd be thrilled if I could get there one day. The tradeoff is reasonable to me, minimizing floor space today in exchange for requiring expensive plates in the future, until I upsize my space.

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