I guess this is the right newsgroup for this one. Its not quite Sieg v
Myford but you can't get more uk.rec.models.engineering than meccano.....
My 7 yr old has one of the (French manufactured) meccano sets. Alas, he is
having difficulty because the nuts and bolts keep coming undone - and its
turning him off it.
I don't seem to remember having that much trouble 45 yrs ago when i used to
be an avid fan. Its not just him - even when i tighten them, they will
still work loose with ordinary handling.
The bolts are different from those I remember - these are allen headed black
things (diameter outside thread 3.5mm - sorry haven't got a thread gauge).
The nuts look similar to my youth - square not hexagonal but i remember them
as marginally thicker. There are many more bolt length options than I ever
used to have as well.
There are some nyloc nuts in the set and I have also locknutted the critical
ones and tried the old varnish trick on the thread but none of these are a
sensible solution. I did ask the chap with all the Army Meccano models at
Brighton exhibition earlier this year but he didn't have the problem.
I guess the nuts or bolts are cheapo with too much clearance and I would be
perfectly happy to buy him some good ones if it means he xxx we can get on
with the big crane with motor - but what do I get and where from - and would
normal hexagonal nuts be Ok for 7 yr old fingers?
15 years ago