Thanks.
The original Carter 33s were built by Bill Barry-Cotter. Kendall Barry-Cotter won 2 national 3/4 ton titles with his Ghost.
Nicke23 you state;
"It is a pain to seal the big aluminium chain plates that go through the deck"
From this text it is interpreted that the two chain plate components - one on each side - were made of flat plate with no welds - is this correct. The text includes "aluminium chain plates" - it is expected that they are stainless not aluminium - is it correct that they are stainless.
It is unknown what chain plate/s design Firetel had. It is probable that they were both flat plate stainless with no welds, suitably secured to the adjacent hull structure.
Wander66 are your chain plates each side the same design, and using a stainless flat plate type with no welds? If you had a photo of each side it would be useful.
My comments were directed at the below welded frame on the port side of the yacht jbarnes85 looked at. My comments were not directed at stainless flat plate chain plates with no welded frames associated with them.

The below photo is not a crack in the paint - it is a crack in the paint which has started in and propagated through the heat affected zone of the weld between the frame members, and into the parent material of the near vertical frame member which is on the inside skin of the topsides. This is a typical fatigue cracking event at a welded joint. Usually the first sign of the crack for the case of a painted weld joint is cracking in the paint, and associated rusting if the structure is out in the weather or subject to condensation.

There are Carter 33's on line with these type of chain plate supporting frames on each side - ie on both sides - whether from flat bars welded together or tube members welded together.
My comment about this type of welded frame design to secure chain plates on yachts is not flippant - it is totally factual and obviously backed up by the evidence above. If you have a yacht of any design type with this type of chain plate supporting welded frame structure, imho it would be prudent to inspect the whole frame by suitable means, and particularly this lower joint area. At the least this would need complete paint removal at the welded joints and visual inspection, but more ideally complete paint removal and a surface NDT examination by a NATA accredited company employing certified (to AINDT) personnel. eg see here;
www.nata.com.au/phocadownload/spec-criteria-guidance/infrastructure-assetintegrity/Infrastructure-and-Asset-Integrity-ISO-IEC-17025-Annex-Non-destructive-Testing.pdfAs a final note in the first photo attached immediately above the use of only two flat plate chain plate bolts securing the stub chain plate to the welded frame is very unexpected. They could be adequate depending on their size and other issues but more than two would be reasonably expected.