As I said I was in hurry so I bought what was only available at the store
NAISH CT Slalom 180-230 cm $329
then straight to the beach and here surprise

I couldn't fit onto my standard mast 460

so I was sure that terrible mistake was made and now I have RDM boom


short drive back to the shop and there with some effort it was proven that could be fited one SDM

just need really hard push
ok will see how next time easy will be to rig, when there is not much room in my sail pocket
or should I file down this brand new boom a bit

or should I return and get another one?
or mayby it will get better after time ?
The question is how much force do we need to put mast into slot?
Should I always use my knee and both hands to pop mast into slot from now on?