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Originally Posted by janoskiss
...WO 2x corrector can be bought from several dealers locally for around $50, or the Burgess 1.9x for $US29 (mail order from Burgess Optical). They screw into 1.25" filter threads, or you can replace the lens assembly in the meade #140 with one of these. I will check how much in-travel the Burgess 1.9x needs in this configuration.
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About 4-5mm in-travel is required. Power is ~1.6x. If you want to 'pull' the focal plane out then you need more of the barrel of the barlow inside the focuser.