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https://www.ebay.co.uk/itm/123419360562
I would be all over this, if it wasn't so dam small.

Okay cheers for info.,

Very nice @Big_Block, is that specific simplex outer cabling?..As I need some that as well!

Where can I get one of those wing nuts.?

Thanks @SideshowBob
I have been messing around with my TDF all day.
I had the derailleur working well but it wouldn't shift into the lowest cog, to get it to work I have had to take it to bits and bend the swing arm out, see the useful side on views on your Gillott thread which shows the Simplex arm splaying outwards at the bottom, mine was bending inwards?.

Find out whether the frame is build for 26" or 27" wheels, if you haven't already.
@ElGato is right about cottered cranks, when set up right they are no problem and will add to the look of the bike.

If anybody is looking for replacement Harden Hub bearings I bought a set of 4 from "Five Ways Belts and Bearings" Sidcup Road Eltham for 12 pound yesterday.
They were very helpful and were quick to identify the metric sizing, I took the old bearings "KLNJ3/8" in just in case but if you quote 3/8, 7/8,7/32 they will know the the size.

Sunday works for me, how about 21st October
last years Cambridge ride was on the 22nd October.

We never did organise a pre 50's ride this summer, we should plan something, I would love to see your Gillott up and running. @7ven, @anidel

Great bike, I can just see faint signs of the frame number on the rear drop out. Any idea? I guess 1950 or earlier judging by the early gb brake levers.

Yes I did, lovely frame and some class components. The rear hub is fixed/fixed. I know this because I emailed the seller yesterday.

This is the first TDF simplex derrailleur I have seen set up like a modern derrailleur, I'm not so sure that's correct. Does it work?

I haven't come across that illustration before very useful.
Note the ridge to the right at the top of the pulley plate, this is to help keep the chain in line.
Where as the pulleys on a modern derrailleur move to and throw to take up slack, it's the derrailleur arm which moves.
The illustration shows the arm in a forward position suggesting the chain is on its largest chain ring, where as mine is on its smallest.

Hmmm! Good call @Jonny69
I think the routing is correct but I have added more tension to the changer spring. It seems to have improved performance, however it still cannot reach the bottom two cogs.
Thanks @Big_Block useful info.

@Big_Block
I bought the derrailleur from EBay described as a 4 speed 3/32 but there is no description or markings to prove this. The chain is 3/32.
I think a set of airlite hubs and 4speed cassette will correct any problems I have with the current set up

durax cranks

Rear 4 speed TDF.
The hubs are campagnolo first generation or second at the moment with a 5 speed Regina hub.

Competition front changer

As Gillott

Simplex gears

I took my A.S.Gillott out around Maidstone today, (see earlier in this thread). The picture shows the bike leaning up against Sutton Valence castle.
it's far from finished but I was testing out the Simplex gearing. I picked up the Simplex cranks and chairing from EBay.France and had the pedal threads re-tapped to fit English pedals. The French cotters are 9mm to the English 9.5mm but it fitted perfectly on my NOS Chater Lea BB., which incidentally at 125mm in length was just about long enough for a double chainring.
The front derrailleur (Simplex Competition) is great fun to use and works effiently enough. The rear derrailleur (Simplex Tour de France) is only working on the largest 3 cogs for the moment.
You probably know this but It's confusing as its sprung in the opposite direction to a contemporary derrailleur, so as you pull the gear lever towards you it pulls the derrailleur down to the smaller cogs.
I am now on the look out for a set of Airlite hubs or similar, I have a set of Asp tub rims and a 4 speed Resilion cassette waiting in the wings.

Im very jealous, that looks amazing and the bikes look fab, I really need to get off my ass and do something like this.

Im assuming model 12 is longer than the 14 if so it's no good, I have an unbranded bb which is 135mm and it's to long.
Thanks for the offer but I have the cups thanks 2 sets and 2 single speed axles.
I have a Chater lea model 1815/2 bb Im going to give that a try but I'm sure it's still to short, problem is I Am using a Simplex competition (clanger) type front changer which leaves no room for adjustment.

Doh..! I need model 14 not 15.
I could swap for model 15 the single speed NGCC version.

Anyone got a Bayliss model 15 bottom bracket axle they don't need.
Or anything similar must be 130mm.
I have a Bayliss size 14 axle (see pic) I could swap.