Buy initially failing vehicle can take a 190x140 box spring steel or upholsterer; I sought a more practical and less costly in shipping. Sold FOB at amazon, I rode alone 30mn approx. because the screws are very long but has screwed everything solid. Of course do not forget to strengthen the vertically central wooden beam of the bed with such a large magazines pile in the middle and under the bar of the bed because CAUTION A BREACH OF THAT CI under the weight of more than 2 people. ..... I have paid the price with my old box spring set on a wooden frame (bed type, louis xv) the central beam is split 15 days after the purchase under the weight of an adult and 2 children playing above MDR. (hence the central reinforcement when the bed is wooden with a minimum of 140 width).
Disadvantage of uncoated wood (as a box spring) it squeaks EVERY movements because the assembled wooden frame turns out rather squared, one caliber but wood touch wood supports are grind everything. RESOLUTION of the problem put the fabric (I have put polar) between support if you and wooden mattress frame on EVERY this support. since silence is golden .......