I did some research on this a long time ago so forget some of the details. Here is what I recall:
- The problem (split fore ends) and the solution (dowel or screw) was not limited to Ishy rifles or is always an Ishy only solution to the problem
- Early problems in the "UK" were solved by a dowel rather than a screw and a very neat job was usually done
- Later UK problems were solved by a screw but a much smaller headed screw head was used that did not go all the way through the stock and a much neater job was done
- Only Ishapore did a rather ugly job with a large screw that went right the way through and look ugly and crude from either side
- Screw does not necessarily equal Ishapore unless it is really ugly and goes all the way through
I am sure that people more expert than I may have other information and this may all be incorrect bit was what I could gather at the time. Most people seem to think that any screw automatically means Indian repair but I found this was not so. For example a friend of mine has a Long Branch No 4 that has clearly never been to India but it does have a neat screw repair. Unfortunately everyone assumes it is an Ishy rifle despite there being no evidence to support this.