I tried very hard to work with Venhill as well but failed,
I was already negative about them because of the complete seizure (yes I mean complete seizure as in jammed solid) on Longshanks Eagle clutch cable, after I collected him in said Black Forest and loaned him TOG, not a good start, when I ordered a new speedo cable from Slater's I was not pleased when it arrived and it was marked along the conduit length with "Venhill", but hey ho, lets fit it, result, speedo not working, after long attempts to find out why, I mean its a new speedo cable for fornicatings sake, everything worked prior to me stupidly wrenching the cable whilst refitting the front wheel, so I thought I had found the error on the cable and went to Venhill and had a custom one made and it cost me plenty, back at home, still no speedo working, so the next day I went to Venhill again, and this time took a speedo drive gearbox and an instrument cluster and said "you take the dims and make me a new cable" which they did and I paid yet again, that's three cables now, one stock item ex Slaters and two custom made ones, all of them Venhill, still no speedo working, in despair and thinking of ending it all, an ex dealer of very long standing offered me a very slightly soiled new old stock factory supplied cable, for free (thanks ten million, mate you know who you are) instantly fitted and working, and a year on all is still good. These failures were doubly important to me because I was travelling to Spain for the Colombres rallies and a speedo clocking distance travelled is vital, and I went without that facility, which meant I was almost entirely reliant on companions doing the navigating, very tedious, to spend three weeks looking at an English reg number.
I did phone them and ask if they would like me to remove this factory old stock cable and bring it to them for analysis and measurement, and they could not give a natural insemination. I also wish to note here that the old biddies in the reception/office, are very hostile and should not be customer facing. Bring back Lurch (those that understand will know what I mean by that)
So the dims they have are wrong, make what you will of that. I must state here that this applies only to triples fitted with ND "box of clocks" as Honda and not the ND separate clocks. The "box of clocks" has the speedo on the left, so the cable is longer, it may well be that Venhill speedo cables for separate ND clocks are fine, I wouldn't know.
CLEM
and stick to the intervals. 
