Hm! Rattled my bin lid now. Will have a look at ours but may be different to TO1. What say you 'Wil'
If you have anything to say put it on open forum not p.M.
Looks simple enough on ours. Two 3mm pegs, soft enough to drill, to register and fix the, probably, interference fit barrel.
As said, don't know if TO1 is same.
I'd say unless you are very sure how the barrel is fixed in the action, leave well alone.
I rebarrelled a 52 some years ago.
The barrel was fixed with a cross pin, but was also fitted on splines. That barrel needed pressing out after the pin was removed.
B.A.S.C. member
Looks similar jules,I think i'll leave it as is,I haven't the confidence,to start drilling stuff give me some timber i'd be ok