Dear ETRTO 520
In answer to the various points made in your messages, the Boardwalk Lite (nee Helios) has a traditional fork that is curved forward rather than the straight fork that you have on your Boardwalk. The fork tubes are bent inwards at the top.
I do hope that you can find the correct tool with its controlled spreading mechanism rather than having to resort to the crowbar(!) or the use of wooden blocks being hammered down to spread the forks.
I don't have any information about the weight of the other riders who have had the forks of their Dahons spread. In my own case, I am 5ft. 9in. tall and weigh 178 lbs.
Regarding your query about tyres, I found that the semi-slick tyres that were fitted originally to the Boardwalk Lite and to my wife's Giant Halfway had little or no grip on our rough cycle paths and towpaths in wet or frosty weather and punctured with distressing frequency - one every other week. So we changed to Impac 20 x 1.75 BMX tyres on both bikes. These give much more grip and also a softer ride. Besides which, the number of punctures has been greatly reduced - two on the Halfway and one on the Boardwalk Lite over a period of two and a half years - with continuous use of the two bikes.
At the time of the BMX tyres being fitted, the Big Apple tyres were not on the market. However, in March of this year, during a visit to Boston, I bought a Helios P8 (at a saving of $300 over the U.K. price!) and shipped it back home as accompanied baggage. The semi-slick tyres fitted on the Helios were again quite unsuitable for our conditions. So I did consider fitting the Big Apples as replacement tyres. However I was put off doing so by the discussions on the Dahon Forum which indicated that, if the Big Apples were fitted, then there was insufficient room to fit mudguards (fenders) - which are essential in our weather conditions. So I fitted Marathon Plus tyres in conjunction with the Dahon special edition SKS P45 mudguards which provided just enough clearance. These tyres give a reasonable grip but have a much firmer ride than the BMX tyres. So far, they have lived up to their reputation as being highly puncture resistant.
Gordon Petrie