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Hi Warren,
You should have received a parfocal ring with the LPI, this goes around the base of one of your 1.25" eyepieces to adjust the focus point of the eyepiece close to what your LPI would be, (this is usually with the eye piece pulled out about half way). You then clamp the parfocal ring and you can change between eyepiece and LPI with no focus change.
I found it best with about a 12-15mm eyepice, the LPI is usually approximated at a 9mm eyepice for FOV.
So
1) Put parfocal ring around 1.25"nose of eyepiece
2) slide eyepiece into focuser only about 1/2 way
3) clamp parfocal ring to hold eyepiece at the 1/2way insertion distance
4) adjust focus on bright object ie moon
5) swap to LPI, inserting LPI all the way into focuser
6) adjust focus to bring LPI to focus
7) remove LPI
8) replace eyepiece with parfocal ring attached, but dont adjust focus
9) adjust eyepiece insertion distance in focuser to bring eyepiece to correct focus by varying the parfocal ring
10) clamp parfocal ring at set distance from step 9
11) swap back and forth between eyepiece and LPI
12) enjoy.
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