10wt. is a bit too light. The original oil was roughly equivalent to 20wt.
Try your local motorcycle shop - they usually offer fork oil (for m'cycle
front forks) in 20 wt.
British Sportscar Center
From: Susan and John Roper <email@example.com>
To: firstname.lastname@example.org <email@example.com>
Cc: firstname.lastname@example.org <email@example.com>
Date: Wednesday, April 01, 1998 8:04 PM
Subject: shock oil
>Might any of you knowledgible folk be able to advise me regarding the
>proper shock oil for use in armstrong lever arm shocks. One of the
>national rebuilders advises that they use hydraulic jack oil, 15 to 30
>weight, from the auto parts store, in their rebuilds. All I can find is
>10 wt. locally. Is that ok. How about for competition use. Don't I
>want heavier weight? Sources? Thanks, John Roper