Sharpening mitre trimmer blades

[Glynne]

I have a Dakota mitre trimmer which I use for fine tuning mitres on boxes and box trays. Way overdue, I decided I would take the blades off and re-sharpen which I have managed to some extent but wondered if there was an established way to do so!
I used lapping film on float glass but the size of the blade means it is awkward to ensure the secondary bevel is flat when sharpening - the primary bevel is fine because it is so large.
In the end I simply "tuned up" the secondary bevel with a diamond card sharpener (normally reserved for router cutters) and whilst it is better, I'm sure thee has to be a better way.
Any thoughts please?

 

[bugbear]

I have a (very old) Briton trimmer, and sharpen the blade Japanese style - since the blades are short thick the primary bevel is HUGE, and I just sit the blade on the primary bevel, and sharpen the primary. It's self jigging.

BugBear

 

[Glynne]

Thanks BugBear.
The only problem with your solution is that my secondary bevel is quite large (3mm) and so to sharpen on the primary bevel alone might mean removing quite a bit of metal? I'll give it a try and see how it goes as I have most sharpening systems.

 

[mbartlett99]

Just a thought but Morso blades only come with a primary bevel - and professionally resharpened they only ever have a primary.

 

[Glynne]

Could well be, but mine have a clear secondary bevel and it wasn't me who put them on!
Lion trimmers are based in Birmingham (next door to me) but I don't know if they sharpen other suppliers blades (they charge ~ £20 for their own). As I have most sharpening paraphernalia I would hope to be able to do it myself and hence the post.