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If yours is like the picture from @Pifko you'll have had the same problem I did with my one I put together. Stupidly tight to get onto the valve.
Trick was to sand off a few mm of the presta-schrader adapter part, so it sits flush with the 90ยบ piece. I went to (a well-known shoe repair chain) and used the rough band on the shoe finisher to sand mine down probably 5mm so it screws in well. Much better fit on the wheels now.
Not perfect, but it works now. Check your adapter, maybe if you even hacksaw the valve adapter you can make the necessary modification.
Argh so I have just got an Ambrosio track disc but the pump adaptor I had already (from the UK TT Facebook group guy) doesn't fit. I definitely had a crack pipe style one at some point but I can't find it now so I must have sold it with the last disc.
Does anyone in East London have a spare? Or know of somewhere that sells one that I could get today?