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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Restoring the last of the series "A" Comets.
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<blockquote data-quote="A_HRD" data-source="post: 84678" data-attributes="member: 49"><p>The one's I have with evidence of black paint are 3/8"BSF. </p><p>But a pair of obvious shiny reproduction ones that I picked-up in the US years ago are UNF!! Ugh! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek! :eek:" loading="lazy" data-shortname=":eek:" /><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite11" alt=":rolleyes:" title="Roll Eyes :rolleyes:" loading="lazy" data-shortname=":rolleyes:" /></p><p></p><p>This leads on to some other issues regarding spring-box fasteners. Referring to Bill Parr's Series A Spares List on Pages 46/47; </p><p></p><p>1. Don't forget that the F94B bolt, that the brass knobs screw on to, has a rounded head (slightly domed) to stop people trying to turn it with a spanner. This is important because just under that head, and touching it, is a transverse steel pin pressed-in to prevent the bolt from turning with the brass knob. For reference the bolt is 2-1/4" long (under head) with 1-1/4" of thread. </p><p></p><p>2. The late great Bob Stafford told me there are were different materials for the spring claws (e.g. mine are Al Alloy - but it is a TTC<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite6" alt=":cool:" title="Cool :cool:" loading="lazy" data-shortname=":cool:" />) and different threads in them from 1933ish to 1939. The Bill Parr listing shows the corresponding "570" thin nut on the spring eyes as 7/16 CEI (which means it is not a post-war BSF "570" then!). I've not seen a 7/16 x 26 CEI spring claw but mine are quite clearly 7/16 x 20 Whitworth-form threads (on a std Whit hexagon) - the 20tpi's being a derivative of the CEI offerings. (I made up a small batch in SS if anyone finds they need a set). </p><p></p><p>The post-war Vincent guys really don't know just how lucky they are by having every last detail of their machines fully documented, part-numbered and available!!! That said, there's nothing better than a challenge to keep the grey matter functioning.... </p><p></p><p>Peter B</p></blockquote><p></p>
[QUOTE="A_HRD, post: 84678, member: 49"] The one's I have with evidence of black paint are 3/8"BSF. But a pair of obvious shiny reproduction ones that I picked-up in the US years ago are UNF!! Ugh! :eek::rolleyes: This leads on to some other issues regarding spring-box fasteners. Referring to Bill Parr's Series A Spares List on Pages 46/47; 1. Don't forget that the F94B bolt, that the brass knobs screw on to, has a rounded head (slightly domed) to stop people trying to turn it with a spanner. This is important because just under that head, and touching it, is a transverse steel pin pressed-in to prevent the bolt from turning with the brass knob. For reference the bolt is 2-1/4" long (under head) with 1-1/4" of thread. 2. The late great Bob Stafford told me there are were different materials for the spring claws (e.g. mine are Al Alloy - but it is a TTC:cool:) and different threads in them from 1933ish to 1939. The Bill Parr listing shows the corresponding "570" thin nut on the spring eyes as 7/16 CEI (which means it is not a post-war BSF "570" then!). I've not seen a 7/16 x 26 CEI spring claw but mine are quite clearly 7/16 x 20 Whitworth-form threads (on a std Whit hexagon) - the 20tpi's being a derivative of the CEI offerings. (I made up a small batch in SS if anyone finds they need a set). The post-war Vincent guys really don't know just how lucky they are by having every last detail of their machines fully documented, part-numbered and available!!! That said, there's nothing better than a challenge to keep the grey matter functioning.... Peter B [/QUOTE]
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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Restoring the last of the series "A" Comets.
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