Hi Dave,
I don't really use solenoid point motors other than a few left over PECO ones. I prefer the slow motion motors for which you need the SP extension. I chose to discontinue use of the SP as it was uneconomical. The SP is mainly designed to be compatible with Continental solenoid point motors which need lees oomph than the PECO however they have designed the SP so that it is compatible with PECO point motors too. It is worth giving it a try to see if they work OK. The Continental solenoid motors are mainly designed to clip into the track made by the same manufacturer as per ROCO, Flieshmann and Maerklin therefore they will not be much use with PECO track. What track are you using?
Thanks for your kind comments.
Regards
Neil