in terms of mounting some part resisted but have not finished will follow suit. just try with other pieces. by cons for the use, it's heavy I got bruises on my calves the first minutes. it's hard enough as foam and one feels well enough. for those who like me not begin worth taking so heavy. you need to know is that the mere fact of the hoop involves having clenched abs thoroughly so just working to keep the hoop moving which believe me is work all the abdominal (and this as long as we did not do one does not realize it). in terms of massage jespérais how heavy it is and not as nice as I thought I did not do as much as I thought. so the massage is not done. so I opted for a simple 640 gr which anyway will turn and activate the traffic but without hurting and therefore be used longer. reminder I bought and also went dry one with the magnets 48 because there is the horror. 2 rounds and it's good I stop as it is too painful! but as it is lighter it turns more easily. but pain issue, ah! No! also I did in any 2mn in 4 days! so lavishly useless (AND I wore clothes on me, so that's saying! on bare skin it must be torture)