Hi Jessie
You sound as if you are well sorted out LOL
Ther crutches that I sawed {or my husband sawed} were my crutches that I had bought.
Yes I noticed they sold the full crutch but I had bought mine by then so didnt pay much attention.....are they coloured? or grey like NHS ones?
The flexifoot just pulls off and you put the ordinary one back on if necessary or a new one.
I havent had new ones yet apart from the flexifoot which is completely different anyway so I dont know about new ones.
Whats the shopping trolley like...do you push or pull it? Has it a square shape top?
I dont think I could balance for very long with just one and pulling a trolly but you are doing well.....I would love to be able to have something that i could put things in.....even my wheel walker which I used to use before it fractured what good.....small basket, put things in bags and hang them on the handles but I dont seem to be able to use it now.
I've tried but it doesnt give me enough support for the fracture {which is never going to heal}
I def. need a "big handbag" LoL most females do I think 
I can still drive so thats OK.
You havent rambled.......its very interesting
Thats my problem.....2 crutches and one back pack and it doesnt provide much space for things
Any suggestions are welcome lol
My one good thing is I have adapted a pouch that I used to have for the gym, to carry my locker key and some money in it.
I've got a cable tie around the crutch just above the handle, and a clip that clips onto the cable tie....in that little pouch is my mobile, lipstick, small mirror, cash card, startbucks coffee car, costa card Boots card Superdrug card, sweetner for coffeeand paracetamol......thats all easy to get at especially my mobile if it rings....dont have to stop and prop the crutches up get the back pack off and search for mobile or other things.
But its not great...just the best I can do
So Like I say...all suggestions are welcome
Love
Eileen UK