Looking at the brochure I can see mine is not a 1959 model anyway
Not so,
Vmow.
I know that brochure and it is
misleading.
In very late 1958 the
Diaphramatic air-cleaner appeared in newsprint.
In early 1959 Boundy took out full-page newsprint ads featuring the new air-cleaner.
This leads me to believe that the 1959 range brochure was produced in mid-late
1958 but
before the new air-cleaner was specified.
The Diaphramatic system was standard fitment on 1959 BMS engines.
[fitted to lawnmowers]
Why the late change for the 1959 range?
Best guess, to beat Victa at their own game. Victa would retaliate with their new
paper element air-cleaner in late 1959!
Pace was clearly in Victa's sights at this time.
But ... Boundy was number three!!! [Best guess].
Note the change in factory advertising between October and December 1958.
Note the copy in the March, 1959 advert.
Hope this helps.---------------------------------
Jack