As a rule I would say no, unless it has an adjustable tree of course! I know some saddles can be adjusted, but personally I would never mess with how it was initially made.
There is a machine that most saddlers have access to that can widen a saddle fractionally (up to about half a width fitting). The tree is stretched.
Personally not something I would do as it weakens the tree and will make resale more difficult.
It will depend on the width of the tree, if the saddle has been flocked up to fit a narrower horse then you will be in luck. If its a narrow tree on a medium horse a good saddler can possibly make it a bit wider but as B&J says it affects the resale value.
Most trees cannot be adjusted hence why people like Saddle Company and Kieffer saddles. People have asked me to adjust their saddles in my saddle company machine but I always warn them that they are taking the chance that the tree will be affected. It costs abut £150 ish (sometimes more) to have the tree replaced.
The tree has to have a metal gullet that can be adjusted - some saddle do not have this (like some of the Whitaker saddles). It is a risky procedure and I dont do it really (unless very dire circumstances).
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Is the description about it and it says it has a steel reinforced spring tree?
the Lemetex spring tree is meant to flex and adjust to the movement of your horse's back. Therefore I think attempting to widen it will mean that it wont move in the same way.
I really wouldnt try to widen anything that isnt designed to be widened (like Saddle Company or Kieffer saddles). You could always ask Lemext if they could do something at their factory but I doubt they will want to compromise the tree either.
I really don't think a narrow fit will fit Blue as the dressage saddle i bought was a medium and it needs adjusting and re flocking as doesn't fit quite right.
Back to square 1... can you do 'wanted' posts on here?
Sorry its late, but just looking back as not been on for few days. I have a Lemetex saddle that is in the tack shop being sold. It came with my new horse and although it fits well at the top of the withers, as she has high withers at the minute, the tree points further down the withers were causing pressure marks as it was too narrow. It is a narrow saddle. Perhaps it fit her when they had her but since I`ve had her, I`ve been working her differently and she has possibly got more muscle! But as soon as back person, who is a saddle fitter for saddle company saddles, told me this, I immediately got on the phone to my saddle fitting friend, and he told me that he couldn`t alter it and she needed a saddle with wider tree points and a deeper gusset etc. Anyway, I took her to have a saddle fitted and we now have a Stubben. It fits lovely.
So in answer to your question, no you cant have it altered if it is too narrow. He told me about the machines but there have been so many tales about the tree points snapping and not being noticed, and this too has caused problems so not many people bother with this now.
Hope this has helped.