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See Homepage. This page: Fitting instructions for these popular car mirrors, dating to the 1960s.

Desmo Boomerang.

I'd imagine that if a survey of the most popular motoring accessories was held of motorists in the 1950s and 1960s, that the purchase and fitment of aftermarket rear view mirrors - that were often not a standard fitting - would be very near the top of the list. This leaflet was given out by Desmo Limited, of Brierley Hill in Staffordshire, and it pertains to the fitment of their Boomerang wing mirrors, named so because if they were knocked backwards, say by an irate pedestrian or a disgruntled cyclist, they could be popped back into their "saved" position once more. Compare this to a fixed wing mirror, which if given a thump or a hefty shove, would likely dent the top of the wing - or snap the mirror clean off.
Boomerang mirrors weren't perfect of course. In about 1992, I left my A40 parked outside my parents' house as usual, only to return to it in the morning to note that a cretin of dubious moral standing had not only leant on my shiny Desmo mirror, but had in fact torn it clean off, leaving a mild dimple in the top of the wing as a bonus. Very annoying. For a minor bumping-into though, they worked well.
This leaflet, shown and transcribed below, specifically relates to the correct installation of a Boomerang mirror.
Fitting Desmo Boomerang car mirrors

Positioning of Desmo "Boomerang" Wing Mirrors.

With the vehicle on a flat surface and with a clear view rearwards, sit in the driving seat of the vehicle in the normal driving position.
With an assistant holding the mirror upright on the wing have the mirror positioned so that the widest possible range of vision is obtained (Note: Convex mirror glasses will give a much wider range of vision than flat glasses, but with a smaller image). Remember also that the final position will be 1" lower.
When satisfactory vision is obtained, mark the spot where the base of the mirror stem rests on the wing. In the centre of this mark, drill a small pilot hole (approximately 1/4" diameter) and then with a hole cutter, large drill or file, increase the pilot hole to 5/8" diameter.
With the dust cap, hexagon nut and fan disc washer removed, push the base of the mirror stem through the hole in the wing (leave on the stem the plain steel washer and the rubber washer). Refit the fan disc and the hexagon nut and tighten down the hexagon nut ensuring that the mirror is giving the required vision rearwards. (When tightening the hexagon nut, it may be necessary to hold a spanner on the two flats provided, on the movement base, under the skirt of the mirror stem, to prevent the "Boomerang" mechanism operating, during the tightening of the nut).
When the mirror stem has been locked into position on the wing, check the "Boomerang" movement for freedom of operation. It should be free to ride away from any glancing blow.
If the mirror is now positioned satisfactorily, replace the plastic dust cap on the base under the vehicle wing.
N.B. If a plinth is being fitted with the mirror the procedure is still the same except that the plinth will rest on the vehicle wing, with the rubber washer and plain steel washer on the plinth, and the stem base passing through all three.
The No.168 "Boomerang-Continental" Mirror can be quickly and easily converted into a Caravan Mirror for use when towing by fitting the extension arm and plinth in our No.213 Conversion Kit.

Notes regarding other popular makes and models of car wing mirrors, may be found on this page, within the gadgets and accessories section of the site.
Return to the Motoring Collectables section for more items relating to pre-war cars and garages.

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