Condor Baracchi lugless seat post bolt is missing

My Condor Baracchi lugless frame is missing it's seat post bolt..but this is an integrated seat bolt and doesn't require a retaining bolt (see photo)...I have contacted Ceeway the bike building supplies company....but would a normal bolt work ...at least the front part....Any suggestions?

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ask Condor?

Cap head bolt in whatever thread size would be my starting point.

Might need to ‘turn’ the head down a bit too foot into the lug but that can be done by holding the bolt in a drill and sanding/filing if it has to be.

I have contacted Condor....awaiting a reply but it is an old model...and nothing appears immediately suitable on their website.

A local engineer and cyclist could do that for me....Thanks for the suggestion.

From Condor:

The seat binder bolt is a tricky one as this was an imperial size rather than the more common metric sizes used now. I think that this was a Whitworth thread from memory, I am not sure of the exact size but it would be around 6mm in width.

Where can I find a Whitworth threaded screw with an Alan Key head?

Belton and Slade - Wandsworth High Street / one way system … just along from the old Youngs Brewery ….

Thanks but I am in Biggleswade...in Bedfordshire.

Try http://www.namrick.co.uk they are my go to for anything threaded

Thanks for the tip .. currently the frame is with a local engineering workshop...who is an active cyclist...he is retapping the thread to take a metric bolt and he will use a stainless steel bolt...plus it ain't Whitworth!