I do them here for $150 plus parts, an o-ring kit is $105. On the 2510 they are known to have a problem in that area that "may" require a different cover to give it an improved design of 2 more bolts on the housing. The new parts actually require a second piece for the 2 extra bolts to thread into, but I have a template to drill and tap the 2 new holes into the original cover. The reason for this improved design is that the leverage on the upper housing from the operator "lunging" to a fro in rough terrain,stresses the existing housing causing warpage, the 2 extra bolts helps over come this. So a "normal" re-seal and calibration may not fix your leak,,Darn It,,but running it on my test bench will confirm the need or not for the improved housing...my mail is open if you want to talk about it..